The financial world in Japan has appealed many educational demands after the war. And they have had much influence on the tendency of educational policy. What the financial world has consistently demanded is to diversify educational system. Focusing on it, in this paper we intend to clarify its contents historically. Demands of diversifying educational system was founded on two logics. One was of diversity in social demands, the other was of diversity in the individuals. One of the peculiar features in these days is that these demands have been strongly appealed basing on diversity in ability and aptitude of the individuals. It's thought necessary to diversity educational system because of "esteeming individuality and creativity", and this opinion is firmly related to its recognition of the "post industrial society"