Which Kpop groups are the most popular in Japan?

 From Nikkei Entertainment October issue interview with the music officials in Japan:

- A total of 300 women interested in Kpop were questioned, age group ranging from girls in their 10s to women in their 50s with 60 people from each age group,
- Period of Inquiry: 2011 July 23 - 25th
- The orange represents the respondents who know everything about the groups and their songs.
- The pink represents the respondents who know of the group/members but do not know their songs.
- The percentages for each were added up to give the final percentage.

Male Idols:

1. TVXQ (100%)
2. Supernova (98%)
3. BIGBANG (88%)
*39% of respondends know everything about BIGBANG and their songs. 49% of respondents do not know their songs but know the members of 2PM.
4. 2PM (63%)
5. Beast (60%)
6. Super Junior (40%)
7. SHINee (39%)
8. F.T. Island (36%)
9. DGNA/The Boss (36%)
10. 2AM (32%)
11. SS501
12. Infinite
13. CN Blue
14. MBLAQ
15. ZE:A
16. U-Kiss
17. SHU-I
18. SM☆SH
19. Apeace
20. Boyfriend
21. Teen Top
22. X-5
23. F-CUZ

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TAEYANG always VIP*.*