[Orgmode] cells are deformed in Japanese

[soichi]

hi.  I am a newbie in org-mode.  
My environment is: Emacs 23 and org-mode 7.01h.

I am trying to set up a spreadsheet and its entries are partially in Japanese.  
But if I type in Japanese and hit "TAB", the cells do not align properly. 

| word  | meaning | date | reference |
|-------+---------+------+-----------|
| today | 今日    | 0821 | rss       |
|-------+---------+------+-----------|
|       |         |      |           |

Typing in English is fine.  Only in Japanese.

Is there anyway to resolve this?

soichi