Abstract
In order to provide users with intelligent services, ubiquitous computing needs to make user situation analysis in consideration of users' mobility. Thus, this paper defines context structure for recognizing dynamic changes in users' environment and proposes a model of multi-agent for processing users' context. The proposed context structure distinguishes between dynamic and static contexts according to the volume of context change, and defines communication protocols among agents. By doing so, the user can get service for own in dynamic environment.