This paper reviews the development process of Japanese semiconductor manufacturers and makes clear some problems that they are facing now. Especially, this paper focuses on their fundamental trends. Furthermore, I try to clear the five tasks which Japanese semiconductor manufacturers have to solve under the severe global circumstances. It is important for them to achieve the five tasks for their prosperity. They must confirm their targets clearly and develop a unique semiconductor, the system LSI (Large Scale Integrated Circuit) and the new IC (Integrated Circuit). They have to brash up their ability of R&D. They should seek the new global standards on IC to control the behavior of competitors. So, it is necessary for them to carry out the huge investment for R&D, the new infrastructure and the employment of the many powerful engineers and workers. This paper refers to the nature of global competition and the strategies of Japanese IC manufacturers. They must pursue still greater efforts for the restructuring and rationalization. They carry out a rationalization of manufacturing process and their business aggressively. Furthermore, Japanese Semiconductor companies try to form the strategic alliances with American semiconductor producers or other companies to make the efficient use of the outside resources.