Recently, many scientists in a basic science field have been using highperformance computer to analyze the large-scale data according to developed IT technology. A data center with large computing resources provides high-performance computing resources to scientists. To support various science fields, the large computing resources of data center are frequently re-organized based on its purpose. System software management, account management and infrastructure management are needed to re-organize and manage the large computing resources. However, these management policies take a lot of work and time of the system administrators. In this paper, we propose IMS (integrated management system) to manage computing resources efficiently and to reduce a lot of work and time. IMS not only integrates three separated managements, but also automates infrastructure management. Therefore, IMS provides high availability and usability of whole computing resources as well as reduces re-organizing time and cost of work and time.