diff --git a/src/main/java/info/istlab/ServerTester/Host.java b/src/main/java/info/istlab/ServerTester/Host.java
index 7efa8da..81a8c65 100644
--- a/src/main/java/info/istlab/ServerTester/Host.java
+++ b/src/main/java/info/istlab/ServerTester/Host.java
@@ -91,6 +91,25 @@
 
         menu.addSeparator();
 
+        JMenuItem rmallItem = new JMenuItem("すべてのサーバを停止し、短冊を削除する");
+        menu.add(rmallItem);
+        rmallItem.addActionListener(e -> {
+            for (int i = 0; i < mainPanel.getComponentCount(); i++) {
+                if (mainPanel.getComponent(i) instanceof ServerPanel) {
+                    ServerPanel sp = (ServerPanel) mainPanel.getComponent(i);
+                    sp.server.close();
+                }
+                if (mainPanel.getComponent(i) instanceof ServerPanel4WS) {
+                    ServerPanel4WS sp = (ServerPanel4WS) mainPanel.getComponent(i);
+                    sp.server.stop();
+                }
+            }
+            mainPanel.removeAll();
+            pack();
+        });
+
+        menu.addSeparator();
+
         JMenuItem exitItem = new JMenuItem("Exit");
         menu.add(exitItem);
         exitItem.addActionListener(e -> {
diff --git a/src/main/java/info/istlab/ServerTester/ServerPanel4WS.java b/src/main/java/info/istlab/ServerTester/ServerPanel4WS.java
index 0aea0a4..8f661de 100644
--- a/src/main/java/info/istlab/ServerTester/ServerPanel4WS.java
+++ b/src/main/java/info/istlab/ServerTester/ServerPanel4WS.java
@@ -11,6 +11,7 @@
 
 import javax.swing.JButton;
 import javax.swing.JLabel;
+import javax.swing.JOptionPane;
 import javax.swing.JPanel;
 
 /**
@@ -91,6 +92,8 @@
             } else if (name.startsWith("WhiteBoard")) {
                 new JExecutor("WhiteBoardClient", server.getPort() + " " + server.getBindAddress());
                 // new WhiteBoardClient(server.getPort(), server.getBindAddress());
+            } else if (name.startsWith("SimpleWebSocketServer")) {
+                JOptionPane.showMessageDialog(this, "Sorry, Not supported yet.");
             }
         });
         thread = new Thread(this);