This report is a compilation of presented theses and discussions during the international academic conference on "South and North Korean Language Integration, and the Language of Ethnic Koreans in Japan," which was hosted in Osaka, Japan in October 2010 by the National Institute of the Korean Language. The following are the authors, titles, and main content of the four theses contained in the report. (1) Min Hyun-sik (Professor, Seoul National University) "The Present and Future of Language of South and North Korea and Ethnic Koreans in Japan" The study examined pending issues, including streamlining of language rules and the need for the construction of standardized Korean language grammar with a focus on pending linguistic matters facing South and North Korea and ethnic Koreans in Japan. The work presented the goal of establishing standardized Korean language as a task for the Korean language community in the future. (2) Kim Miseon (Researcher, Ethnology Museum of Japan) "Language Situation of Ethnic Koreans in Japan" The study introduced the situation wherein ethnic Koreans in Japan use dual languages of Korean and Japanese by categorizing those people into different generational groups. The study examined the generational transition of the situation from an era when ethnic Koreans used primarily Korean language, to an era where they use Japanese as their primary tongue and Korean as a de facto foreign language it also focused on the problem of the hierarchical placement of South and North Korean languages in Japan's ethnic Korean society. (3) Kang Jeonghui (Professor, Hannam University) "Linguistic Change of Ethnic Koreans in Japan" Centering on the Jeju Dialect Through a survey of situations among users of the Jeju dialect, the study has discovered that the group which best preserves Korean language among Japan's ethnic Koreans is that of first-generation immigrants, while second- and third-generation ethnic Koreans perceive Korean as a foreign language. As psychological elements of such change, they singled out the waning companionship and consolidation among ethnic Koreans in Japan, as well as a sense of nationalistic inferiority. The study predicted that due to an inflow of young immigrants from South Korea and the influence of the Korean Wave (Korean pop culture) in Japan,the trend of Korean language usage in Japan's ethnic Korean society will become more positive. (4) Song Jaemog (Professor, Osaka University of Economics and Law) "Changes of Curricula at Korean National Schools in Japan" The study examined changes of curricula at national schools in Japan that have offered Korean language education in ethnic Korean society. In the past, Korean national schools in Japan primarily educated its students about North Korea's Juche ideology (self sustenance and independence), but from 1983, they changed their curricula in a way to ensure that ethnic Koreans could adapt to Japanese society with the approach to Korean as a second language. Ethnic Korean educators play an increasingly important role in publication of textbooks, and reinforce Japanese language education.