The new hospital is called `Intelligent Hospital,' where HIS and RIS are installed and a part of PACS will be installed in March 1994. The aim of this system is to optimize the flow and stock of materials and information in the hospital and to provide safe and convenient circumstances for patients and hospital staffs. The preliminary study of a small PACS suggested to us that the integration of HIS, RIS and PACS increase each value of them as a total information system. In this paper we will show the software and concept of our system. (1) Integration of HIS and RIS; concerning with radiological examinations, HIS has the radiological examination order entry system and its scheduling system. The radiologist can get the patient's information at examination and reporting on the RIS terminal and input the drug and film consumption. The data transferred to HIS as billing data. The examination report is also transferred to HIS. (2) Integration of RIS and modalities; RIS sends the patient's data and examination code to FCR (Fuji. Co.) system. (3) Integration of RIS, HIS and PACS; HIS shows reference images with report on the HIS terminal.