This paper reviews the applicabilities and the problems of copyright law and patent law to the computer-related intellectual properties such as data bases and computer softwares, with special reference to the practices in the advanced countries like U.S., U.K., and Japan. It also discusses Japanese proposals of-the new computer program right law which has been based on entirely different concepts of new media. The author concludes that the legal protection devices of any individual countries should be considered in the context of the eventual international agreements.