This paper analyzes and studies all the publications as well as the flow of knowledge and information on the Korea-Japan relationship during the 20th century, especially in the area of culture. For the purpose of the systematic study, the subject area was divided into the following six parts, 1) Civilization at large, 2) Philosophy, 3) Religion 4) Arts, 5) Language, and 6) Literature. As the result of the study, a union catalog for monographic publications from both countries has been produces. The union catalog has produced that more publications have bean issued in Japan than in Korea in every part of the subject. During the part 15 years, however, Korea has produced over 106 publications more than Japan.