How to sync multiple calendar with iPhone4 - 아이폰4 캘린더와 구글 캘린더 싱크하기

• Go to http://m.google.com/sync on safari.
• If you see the error message something like "Sorry Google Sync doesn't support your current mobile ....", 
• Click the link "Language Change" ( The word "Language Change" could depend on your configuration. In korean, "언어 변경"
• Click "English (US)"
• You can see your device list. Click "iphone" and select calenders which you want to sync with iphone4.