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18.56% Yahoo Search Directory
7.53% Google
6.05% MSN Search (not paid- msn search)
3.52% Yahoo Directory Link
3.49% Goo
3.33% Google Yahoo
1.03% Google Nifty
0.99% Google Biglobe
So having a good Yahoo directory listing hitting their keywords has generated 22.08%
Google has brought in 12.88%
Rest- incoming links and searches mainly from google served sites-excite,aol etc. If I were to estimate 75% links 25% searches.
This is to their front page, so they may be getting much more traffic from search engines to their internal pages.
Another thing to remember is that a lot of Japanese "top pages" used to be notorious for having little or no indexable content on them. It's only recently that a majority of them have come around. I still see all FLASH intro pages <yech>. I think you'd really have to analyze the site's design, layout and structure to glean much from this data. Yahoo directory links usually point to the "home page" of a website, but the spiderable content is usually inside.