The paper introduces the information service activities of the Library of the National Association of Commercial Broadcasters in Japan. Documentation activities of this library much differ from those of other institutions because this library takes the position of a business organization of the broadcasting field, and the special nature of the library materials required by the broadcasting enterprises. The library tries to change its passive attitude to an active one with emphasis on building of its basic collection. There are some problems to be solved that arise from the fact that the association itself is one of the information service institutions.