In this study, we examine the computerization activities of local governments to determine the relationships of architecture. Focusing on the characteristics of the design, development, and operation of computerization, we propose the architecture of computerization based on the manufacturing architecture. Furthermore, we analyze several cases and try to classify the information activities of organizations. We also refer our empirical survey to clarify the actual situation of e-government digitization in Japan. We show the classification of computerized activities in a local government and the future use of computerization based on the above considerations.