This paper describes an integration of different Relational Database Management System (RDBMS) of two Course Management Systems (CMS) called Sakai and the Common Factory for Inspiration and Value in Education (CFIVE). First, when the service of CMS is provided campus-wide, the problems of user support, CMS operation and customization of CMS are clarified from past experience. Additionally, various Japanese specific educational practices are reviewed. The candidate CMSs are selected by using proposed methods at Requirements Engineering (RE) research community. Finally, in order to consider possible application of these CMSs, the running environment of different two CMSs are discussed, and the integration of different RDBMS on two CMSs is described. (Contains 2 tables and 3 figures.)