Toyota-style management is the outstanding paragon of Japanese enterprises. However, if we only focus on Toyota-style management when discussing innovation strategies of Japanese enterprises, then we are apt to neglect the most recent innovation tendencies of Japanese enterprises. Thus, this paper will not particularly deal with issues of Toyota-style management, but will make an effort to review relevant documents after 2003 in order to grasp and understand the development of innovation strategies of Japanese enterprises. The study result shows that the ”Humanism” type is more easily to understand, while the ”Product Architecture” type is better able to sketch the contours of the characteristics of typical Japanese enterprises, although it is more abstract and hard to understand. Therefore, along with Toyota-style management, ”Architectural Innovation” theory contributes to our understanding of the overall development tendency of Innovation strategy in Japanese enterprises.