Provided is a module and method for semantic negotiation. In various aspects, it is possible to provide an optimized service to a mobile terminal and a user, without prior knowledge of a service that the user prefers to use, or without a client module of a tightly coupled configuration. The optimized service may be provided by performing a semantic negotiation based on one or more ontologies. Also, it is possible to improve convenience of the user by automatically performing the semantic negotiation between the mobile terminal and a service server without intervention of a user.