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One of the most important objects in IT is to enhance the convenience of human-beings. The ubiquitous computing environment, where user can access any networks without time and space restriction, is a result of aggregation of the latest technologies to provide human-beings various capabilities. In this paper, the dynamic community composing model is proposed. The role of this model is to compose a community according to a user's request. When a problem has happened and a single human cannot handle it, a group of humans need to cooperate. This group is called a community and the proposed model shows the way of composing this group which can solve the problem efficiently. For the efficiency of community, this model works based on the participants' social network, each participant's ability which is needed for resolving the problem, and the current situation of each participant. With this model, a single human can resolve a complex problem with the help of other humans using ubiquitous computing technology.