diff --git a/src/main/java/info/istlab/ServerTester/MulticastReceiver.java b/src/main/java/info/istlab/ServerTester/MulticastReceiver.java
index a1c92fe..fd099be 100644
--- a/src/main/java/info/istlab/ServerTester/MulticastReceiver.java
+++ b/src/main/java/info/istlab/ServerTester/MulticastReceiver.java
@@ -49,6 +49,7 @@
             receivedData.put(addr, message);
             if (remoteHostsWindow != null) {
                 remoteHostsWindow.updateData(addr, message);
+                remoteHostsWindow.frame.pack();
             }
             // System.out.println(addr+"からの受信: " + message);
         }
diff --git a/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java b/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java
index e1832db..2f8b0ba 100644
--- a/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java
+++ b/src/main/java/info/istlab/ServerTester/RemoteHostsWindow.java
@@ -18,9 +18,9 @@
 public class RemoteHostsWindow extends JPanel {
     JTabbedPane tabbedPane;
     Hashtable<String, RemoteHostPanel> panels = new Hashtable<String, RemoteHostPanel>();
-
+    JFrame frame;
     public RemoteHostsWindow(Hashtable<String, String> receivedData) {
-        JFrame frame = new JFrame();
+        frame = new JFrame();
         frame.setTitle("Remote Hosts");
         frame.setSize(300, 200);
         frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);