Nakamura Hidetaka, an editorial officer of the Japanese Government- General of Korea, is also one of the best authorities on the Korean history of Japan after World War Ⅱ. And he has been estimated as a trailblazer in the field of research on the history of international relations of East Asia. In this article, I studied the characteristics and problems of the description of Korean history and Japanese pirates. As a result of this examination, it was verified that his view of history was reflected in his description. That was so-called ``Kogoku shikan(皇國 史觀)`` the thought that the Japanese emperor will and has to rule the whole world in the future, therefore Japan can justify their invasion policy and rationalize their colonial government (in the years 1910-45) on Korea. For example, He emphasized repeatedly the lethargic, incompetence and toadyism of the ruling class of the Koryo(高麗) dynasty in his description. Such a attitude in description can be also verified concerning Japanese pirates of the late Koryo dynasty. He falsified the fact of Japanese pirates as the problem of the conflict and confrontation between the ruling class of Koryo and its governance class. Contrary to this, he did not consider the domestic situation of Japan at that time including the internal war between the South and North court (in the years 1336-92). He had described the Japanese pirates by excluding ``Japan`` completely. It was this period that the family of the Japanese emperor was divided into two courts and fought each other, Samurai as vassals, violated and attacked the emperor and his family, and the fact of Japanese pirates in the late Koryo dynasty were the troops of the South court which has been evaluated as the legitimate government since the Meiji(明治) Modernization of Japan. Nakamura, an enthusiastic adherent of ``Kogoku shikan(皇國史觀)``, struggled to conceal the embarrassing part of the Emperor`s history and in the pursuit of this purpose he had falsified the history of Korea and consequently Japan`s history too.