Index: app/src/processing/app/syntax/im/CompositionTextManager.java
===================================================================
--- app/src/processing/app/syntax/im/CompositionTextManager.java	(revision 6686)
+++ app/src/processing/app/syntax/im/CompositionTextManager.java	(working copy)
@@ -54,6 +54,18 @@
   public boolean getIsInputProcess() {
     return isInputProcess;
   }
+  /**
+   * Insert full width space
+   */
+  public void insertFullWidthSpace() {
+    initialCaretPosition = textArea.getCaretPosition();
+    int layoutCaretPosition = initialCaretPosition;
+    try {
+      textArea.getDocument().insertString(layoutCaretPosition, "\u3000", null);
+    } catch (BadLocationException e) {
+      e.printStackTrace();
+    }
+  }
 
   /**
    * Called when a user begins input from input method.
@@ -115,7 +127,6 @@
    * @param commited_count Numbers of committed characters in text. 
    */
   public void endCompositionText(AttributedCharacterIterator text, int committed_count) {
-    isInputProcess = false;
     /*
      * If there are no committed characters, remove it all from textarea.
      * This case will happen if a user delete all composing characters by backspace or delete key. 
Index: app/src/processing/app/syntax/im/InputMethodSupport.java
===================================================================
--- app/src/processing/app/syntax/im/InputMethodSupport.java	(revision 6686)
+++ app/src/processing/app/syntax/im/InputMethodSupport.java	(working copy)
@@ -73,6 +73,11 @@
   public void inputMethodTextChanged(InputMethodEvent event) {
     AttributedCharacterIterator text = event.getText();
     committed_count = event.getCommittedCharacterCount();
+    if(isFullWidthSpaceInput(text)){
+      textManager.insertFullWidthSpace();
+      caretPositionChanged(event);
+      return;
+    }
     if(isBeginInputProcess(text, textManager)){
       textManager.beginCompositionText(text, committed_count);
       caretPositionChanged(event);
@@ -86,11 +91,21 @@
     textManager.endCompositionText(text, committed_count);
     caretPositionChanged(event);
   }
-
+  
+  private boolean isFullWidthSpaceInput(AttributedCharacterIterator text){
+    if(text == null)
+      return false;
+    if(textManager.getIsInputProcess())
+      return false;
+    return (String.valueOf(text.first()).equals("\u3000"));
+  }
+  
   private boolean isBeginInputProcess(AttributedCharacterIterator text, CompositionTextManager textManager){
     if(text == null)
       return false;
-    return (isInputProcess(text) && !textManager.getIsInputProcess());
+    if(textManager.getIsInputProcess())
+      return false;
+    return (isInputProcess(text));
   }
 
   private boolean isInputProcess(AttributedCharacterIterator text){