Abstract: To reduce costs of developing mobile communication terminals such as PHS communication terminals and facilitate development of mobile communication terminals by a manufacturer that does not have wireless communication technology. A new wireless communication module that is a separate small module comprising only wireless communication portion and a new terminal supporting the wireless communication module are proposed. The wireless communication module of the invention is used by being inserted to a corresponding slot of a terminal supporting the wireless communication module of the invention that has a configuration excluding wireless communication portion from a conventional mobile communication terminal. The present invention reduces burdens of development on terminal manufacturers. The invention also enables a manufacturer that does not have wireless communication technology to develop an original terminal.