diff --git a/src/main/java/info/istlab/ServerTester/NetworkInterfaceSelector.java b/src/main/java/info/istlab/ServerTester/NetworkInterfaceSelector.java
index 8851e1d..db9302e 100644
--- a/src/main/java/info/istlab/ServerTester/NetworkInterfaceSelector.java
+++ b/src/main/java/info/istlab/ServerTester/NetworkInterfaceSelector.java
@@ -1,5 +1,8 @@
 package info.istlab.ServerTester;
 
+import java.awt.Dimension;
+import java.awt.Point;
+import java.awt.Toolkit;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.net.InetAddress;
@@ -8,9 +11,13 @@
 import java.net.SocketException;
 import java.util.ArrayList;
 import java.util.Enumeration;
+import java.util.Hashtable;
 import java.util.List;
 
+import javax.swing.BoxLayout;
+import javax.swing.JButton;
 import javax.swing.JDialog;
+import javax.swing.JFrame;
 
 public class NetworkInterfaceSelector extends JDialog implements ActionListener {
 
@@ -21,21 +28,45 @@
             return ipv4interfaces.get(0);
         } else {
             // 複数のインターフェースがある場合、ユーザに選択させる
-            NetworkInterface[] interfaces = new NetworkInterface[ipv4interfaces.size()];
-            for (int i = 0; i < ipv4interfaces.size(); i++) {
-                interfaces[i] = ipv4interfaces.get(i);
-            }
-            // NetworkInterface selectedInterface = (NetworkInterface)
-            // JOptionPane.showInputDialog(null, "Select a network interface", "Select a
-            // network interface", JOptionPane.QUESTION_MESSAGE, null, interfaces,
-            // interfaces[0]);
-            // return selectedInterface;
-            return null;
+            NetworkInterfaceSelector selector = new NetworkInterfaceSelector(ipv4interfaces);
+            NetworkInterface ni = selector.getSelectedInterface();
+            return ni;
         }
     }
 
-    public NetworkInterfaceSelector() {
+    static JFrame dummy;
+    ArrayList<NetworkInterface> interfaces;
+    NetworkInterface selectedInterface;
+    Hashtable<String, NetworkInterface> hash;
+    boolean okClicked = false;
 
+    public NetworkInterfaceSelector(ArrayList<NetworkInterface> interfaces) {
+        super(dummy = new JFrame("Notice !! Click Here !!"), "ネットワークインタフェースを選択してください", true);
+        this.interfaces = interfaces;
+
+        getContentPane().setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));
+        hash = new Hashtable<String, NetworkInterface>();
+        for (NetworkInterface obj : interfaces) {
+            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(centerOfScreen(getSize()));
+    }
+
+    public NetworkInterface getSelectedInterface() {
+        return selectedInterface;
     }
 
     public static ArrayList<NetworkInterface> getIPv4Interfaces() {
@@ -78,7 +109,10 @@
 
     @Override
     public void actionPerformed(ActionEvent e) {
-        throw new UnsupportedOperationException("Unimplemented method 'actionPerformed'");
+        selectedInterface = hash.get(e.getActionCommand());
+        okClicked = true;
+        dispose();
+        dummy.dispose();
     }
 
     public static InetAddress getPrimaryInetAddr(NetworkInterface primaryInterface) {
@@ -91,4 +125,9 @@
         }
         return null;
     }
+
+    public static Point centerOfScreen(Dimension winSize) {
+        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
+        return new Point((screenSize.width - winSize.width) / 2, (screenSize.height - winSize.height) / 2);
+    }
 }