diff --git a/src/main/java/info/istlab/ServerTester/MulticastReceiver.java b/src/main/java/info/istlab/ServerTester/MulticastReceiver.java
index fd099be..3564cd3 100644
--- a/src/main/java/info/istlab/ServerTester/MulticastReceiver.java
+++ b/src/main/java/info/istlab/ServerTester/MulticastReceiver.java
@@ -7,8 +7,6 @@
 import java.net.SocketException;
 import java.util.Hashtable;
 
-import javax.swing.JOptionPane;
-
 public class MulticastReceiver implements Runnable{
     Thread thread;
     MulticastSocket socket;
@@ -61,10 +59,10 @@
     }
 
     public void openWindow() {
-        if (receivedData.size() == 0) {
-            JOptionPane.showMessageDialog(Host.mainhost, "受信したデータがありません。", "受信データなし", JOptionPane.WARNING_MESSAGE);
-            return;
-        }
+        // if (receivedData.size() == 0) {
+        //     JOptionPane.showMessageDialog(Host.mainhost, "受信したデータがありません。", "受信データなし", JOptionPane.WARNING_MESSAGE);
+        //     return;
+        // }
         if (remoteHostsWindow != null) {
             remoteHostsWindow.setVisible(true);
         } else {
diff --git a/src/main/java/info/istlab/ServerTester/MulticastSender.java b/src/main/java/info/istlab/ServerTester/MulticastSender.java
index c4e8920..7059725 100644
--- a/src/main/java/info/istlab/ServerTester/MulticastSender.java
+++ b/src/main/java/info/istlab/ServerTester/MulticastSender.java
@@ -51,7 +51,7 @@
 
     private String getServerInfo() {
         JPanel mainPanel = Host.mainhost.mainPanel;
-        System.out.println("Count: "+mainPanel.getComponentCount());
+        // System.out.println("Count: "+mainPanel.getComponentCount());
         // 情報収集
         StringBuffer sb = new StringBuffer();
         for(Component c: mainPanel.getComponents()){
diff --git a/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java b/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java
index 2f8b0ba..daefe63 100644
--- a/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java
+++ b/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java
@@ -23,7 +23,7 @@
         frame = new JFrame();
         frame.setTitle("Remote Hosts");
         frame.setSize(300, 200);
-        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+        frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
 
         tabbedPane = new JTabbedPane();
         frame.getContentPane().add(tabbedPane);
@@ -46,8 +46,8 @@
             panel.renewal(value);
             tabbedPane.validate();
             tabbedPane.repaint();
-            System.out.println("Tab updated " + addr);
-            System.out.println(value);
+            // System.out.println("Tab updated " + addr);
+            // System.out.println(value);
         } else {
             RemoteHostPanel rhp = new RemoteHostPanel(addr, value);
             tabbedPane.add(addr, rhp);