In this project, we study community support technologies based on intelligent agent. In existing support systems, each system is built by different programming languages. When their information are used in ohter systems, information data is converted. We use XML language for the interchanging and holding information in community. Public data should be separated from private data in the holding. We construct intelligent support systems for community information holding. In our system, mediating-agent is adopted in information management. The mediating-agent manages information based on the contents and sources.