diff --git a/src/main/java/info/istlab/IoTP/App.java b/src/main/java/info/istlab/IoTP/App.java
index 9e97b73..92b828d 100644
--- a/src/main/java/info/istlab/IoTP/App.java
+++ b/src/main/java/info/istlab/IoTP/App.java
@@ -32,7 +32,6 @@
     public static Path execPath;
     public static String downloadurl = "https://cit.istlab.info/IoTP/target/";
 
-    
     static {
         userhome = System.getProperty("user.home");
     }
@@ -48,19 +47,14 @@
         iotDirs = new ArrayList<File>();
         findDotGitFileRecursive(new File(userhome), iotDirs, 0); // 指定フォルダ以下の.gitを探索する
 
-        if (iotDirs.size() == 1) {
-            workingDir = iotDirs.get(0).getAbsolutePath();
-            System.out.println(workingDir);
-            new Launcher(iotDirs.get(0)).setVisible(true);
-        } else if (iotDirs.size() > 1){
-            System.out.println("フォルダが複数みつかりました");
-            for(File f: iotDirs){
-                System.out.println(f.getAbsolutePath());
-            }
-        } else {
-            
-        }
-
+        FolderSelector<File> fs = new FolderSelector<File>(iotDirs, "フォルダが複数みつかりました。フォルダを選択してください。",
+                "フォルダが1つもみつかりませんでした");
+        File ret = fs.getSelectedItem();
+        if (ret == null)
+            System.exit(0);
+        workingDir = ret.getAbsolutePath();
+        System.out.println(ret);
+        new Launcher(ret).setVisible(true);
     }
 
     public static void findDotGitFileRecursive(File dir, ArrayList<File> iotDirs, int level) {
@@ -84,7 +78,6 @@
         }
     }
 
-
     public static Path getApplicationPath(Class<?> cls) throws URISyntaxException {
         ProtectionDomain pd = cls.getProtectionDomain();
         CodeSource cs = pd.getCodeSource();
@@ -150,7 +143,7 @@
         try {
             processBuilder.start();
             System.exit(0);
-        }catch(Exception ex){
+        } catch (Exception ex) {
 
         }
     }
diff --git a/src/main/java/info/istlab/IoTP/Editor.java b/src/main/java/info/istlab/IoTP/Editor.java
index a79063a..9702068 100644
--- a/src/main/java/info/istlab/IoTP/Editor.java
+++ b/src/main/java/info/istlab/IoTP/Editor.java
@@ -237,7 +237,7 @@
 
     @Override
     public void keyPressed(KeyEvent e) {
-        System.out.println(e.getKeyCode());
+        // System.out.println(e.getKeyCode());
 
         if (e.isControlDown() || e.isAltDown() || e.isAltGraphDown() || e.isMetaDown()) {
             if (e.getKeyCode() == 83) { // Save
diff --git a/src/main/java/info/istlab/IoTP/FolderSelector.java b/src/main/java/info/istlab/IoTP/FolderSelector.java
new file mode 100644
index 0000000..f4239fa
--- /dev/null
+++ b/src/main/java/info/istlab/IoTP/FolderSelector.java
@@ -0,0 +1,92 @@
+package info.istlab.IoTP;
+
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.util.ArrayList;
+import java.util.Hashtable;
+
+import javax.swing.BoxLayout;
+import javax.swing.JButton;
+import javax.swing.JDialog;
+import javax.swing.JFrame;
+import javax.swing.JOptionPane;
+
+public class FolderSelector<E> extends JDialog implements ActionListener {
+    ArrayList<E> options;
+    Hashtable<String, E> hash;
+    String messageIfZero;
+    boolean okClicked = false;
+    E selectedItem;
+
+    public FolderSelector(ArrayList<E> opts, String message, String _messageIfZero) {
+        super(new JFrame(), message, true);
+        options = opts;
+        messageIfZero = _messageIfZero;
+
+        getContentPane().setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));
+
+        // add(new JLabel(message));
+        hash = new Hashtable<String, E>();
+        for (E obj : options) {
+            String label = obj.toString();
+            JButton b = new JButton(label);
+            b.addActionListener(this);
+            add(b);
+            hash.put(label, obj);
+        }
+        JButton cancelB;
+        cancelB = new JButton("cancel");
+        cancelB.addActionListener(e -> {
+            okClicked = false;
+            System.out.println("Cancel is clicked.");
+            dispose();
+        });
+        add(cancelB);
+        pack();
+        setLocation(SerialWindow.centerOfScreen(getSize()));
+    }
+
+    public boolean showDialog() {
+        okClicked = false;
+        setVisible(true);
+        return okClicked;
+    }
+
+    public E getSelectedItem() {
+        if (showDialog()) {
+            if (options.size() == 0) {
+                JOptionPane.showMessageDialog(null, messageIfZero);
+                return null;
+            } else if (options.size() == 1) {
+                return options.get(0);
+            } else {
+                return selectedItem;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        selectedItem = hash.get(e.getActionCommand());
+        okClicked = true;
+        dispose();
+        // SerialPort selectedsp = SerialPort.getCommPort(e.getActionCommand());
+        // SerialWindow sw = new SerialWindow(selectedsp);
+        // SerialWindow.hash.put(selectedsp.getSystemPortName(), sw);
+
+        // frame.setVisible(false);
+    }
+
+    // public static void show(ArrayList<E> opts) {
+    // JFrame jf = frame = new JFrame("Select SerialPort");
+    // jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+    // jf.getContentPane().add(new FolderSelector<E>(opts));
+    // jf.pack(); // 内容物でサイズを自動設定する
+
+    // Dimension winSize = jf.getSize();
+    // jf.setLocation(SerialWindow.centerOfScreen(winSize));
+    // jf.setVisible(true);
+    // }
+}
diff --git a/src/main/java/info/istlab/IoTP/Launcher.java b/src/main/java/info/istlab/IoTP/Launcher.java
index 6f865e6..530c17f 100644
--- a/src/main/java/info/istlab/IoTP/Launcher.java
+++ b/src/main/java/info/istlab/IoTP/Launcher.java
@@ -13,7 +13,6 @@
 import java.util.Enumeration;
 import java.util.Hashtable;
 
-import javax.swing.JCheckBoxMenuItem;
 import javax.swing.JFrame;
 import javax.swing.JMenu;
 import javax.swing.JMenuBar;
@@ -31,10 +30,8 @@
     // JPanel mainP;
     File root;
     JTree tree;
-    JCheckBoxMenuItem jcbmi;
     Hashtable<File, Editor> file2editor;
 
-    // all generated processes (maybe alive only)
     public static ArrayList<Process> allProcs = new ArrayList<Process>();
 
     public Launcher(File _root) {
@@ -175,7 +172,7 @@
     }
 
     public void reloadFiles() {
-        FileTreeModel model = new FileTreeModel(root, jcbmi.isSelected());
+        FileTreeModel model = new FileTreeModel(root, false);
         tree.setModel(model);
     }
 
@@ -185,7 +182,7 @@
         // if () {
         if (isLatest) {
             JOptionPane.showMessageDialog(this,
-                    "すでに最新版です : v" + version + "\n(download folder: " + App.execPath.getParent().toString() + ")");
+                    "最新版です : v" + version + "\n(download folder: " + App.execPath.getParent().toString() + ")");
         } else {
             int res = JOptionPane.showConfirmDialog(this, "最新版 \n(" + App.latestVersion + ") をダウンロードする?\n(download folder: "
                     + App.execPath.getParent().toString() + ")");
diff --git a/src/main/java/info/istlab/IoTP/MyDialog.java b/src/main/java/info/istlab/IoTP/MyDialog.java
new file mode 100644
index 0000000..5496b50
--- /dev/null
+++ b/src/main/java/info/istlab/IoTP/MyDialog.java
@@ -0,0 +1,84 @@
+package info.istlab.IoTP;
+
+import java.awt.BorderLayout;
+
+import javax.swing.JButton;
+import javax.swing.JDialog;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JTextField;
+
+public class MyDialog extends JDialog {
+    private JTextField textField;
+    private JButton okButton, cancelButton;
+    private boolean okClicked;
+    
+    public MyDialog(JFrame parent) {
+        super(new JFrame(), "モードレスダイアログ", true);
+        
+        // ダイアログのコンポーネントを設定する
+        JLabel label = new JLabel("名前を入力してください:");
+        textField = new JTextField(10);
+        JPanel panel = new JPanel();
+        panel.add(label);
+        panel.add(textField);
+        
+        okButton = new JButton("OK");
+        cancelButton = new JButton("キャンセル");
+        JPanel buttonPanel = new JPanel();
+        buttonPanel.add(okButton);
+        buttonPanel.add(cancelButton);
+        
+        getContentPane().setLayout(new BorderLayout());
+        getContentPane().add(panel, BorderLayout.CENTER);
+        getContentPane().add(buttonPanel, BorderLayout.SOUTH);
+        
+        // OKボタンが押されたときの処理
+        okButton.addActionListener(e -> {
+            okClicked = true;
+            dispose();
+        });
+        
+        // キャンセルボタンが押されたときの処理
+        cancelButton.addActionListener(e -> {
+            okClicked = false;
+            dispose();
+        });
+        
+        // ダイアログのサイズを設定する
+        setSize(300, 150);
+    }
+    
+    public boolean showDialog() {
+        okClicked = false;
+        setVisible(true);
+        return okClicked;
+    }
+    
+    public String getInputValue() {
+        return textField.getText();
+    }
+    
+    public static void main(String[] args) {
+        JFrame frame = new JFrame("親ウィンドウ");
+        frame.setSize(400, 300);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        
+        // ボタンを追加する
+        JButton button = new JButton("ダイアログを表示する");
+        button.addActionListener(e -> {
+            MyDialog dialog = new MyDialog(frame);
+            if (dialog.showDialog()) {
+                String inputValue = dialog.getInputValue();
+                System.out.println("OKボタンが押されました。入力値は" + inputValue + "です。");
+            } else {
+                System.out.println("キャンセルボタンが押されました。");
+            }
+        });
+        frame.getContentPane().add(button);
+        
+        // ウィンドウを表示する
+        frame.setVisible(true);
+    }
+}