A mobile communication terminal includes an input unit having a plurality of number keys and a plurality of call keys; a controller for instructing a call connection to a wired communication network or to a mobile communication network with reference to a ‘telephone network connection method’ arbitrarily set by a user when a phone number of a receiving side and a specific call key are inputted through the input unit; a mobile communication network connection unit for attempting a connection to the mobile communication network according to an instruction from the controller; and a wired communication network connection unit for attempting a connection to the wired communication network according to an instruction from the controller. The mobile communication terminal is implemented to be connected with the wired communication network through the AP installed in a building (or in a room), for which a subscriber can arbitrary set the telephone network connection method, simplifying the procedure for selectively connecting to the mobile communication network (the CDMA network) and the PSTN. Thus, the subscriber can easily and conveniently operate the mobile communication terminal.