--- a/src/alice/topology/manager/keeparive/RemoveTask.java	Mon Mar 31 22:28:52 2014 +0900
+++ b/src/alice/topology/manager/keeparive/RemoveTask.java	Thu Apr 03 20:26:23 2014 +0900
@@ -15,21 +15,18 @@
 
 	@Override
 	public void run() {
-		System.out.println("cccc");
 		ListManager list = info1.asClass(ListManager.class); // explicit cast
 		TaskInfo task = info2.asClass(TaskInfo.class);
 		TaskExecuter exec = TaskExecuter.getInstance();
 		if (exec.compareNowTask(task)){
 			// case: remove task is state countdown.
-			System.out.println("delete task");
 			exec.skip();
 		} else {
 			boolean removeFlag = false;
 			// case: remove task is still in the waiting queue.
 			for (TaskInfo t: list.getTaskList()){
 				if (t.getType().equals(task.getType())){
-					list.getTaskList().remove(t);
-					System.out.println("delete task");
+					list.getTaskList().remove(t); // this operation should be executed by list Manager.
 					removeFlag = true;
 					break;
 				}