In a communication system of the present invention, a mobile communication terminal 100 includes: a used device information storing means 101 for previously associating and storing designated location information and used device information specifying a communication device to be used depending on a location; a location information acquiring means 102 for acquiring location information representing a location of the terminal itself; and a used device information transmitting means 103 for transmitting the used device information associated with the designated location information corresponding to the acquired location information, to a connection control device. Moreover, the connection control device 200 includes a connection controlling means 201 for considering a communication device corresponding to the used device information transmitted from the mobile communication terminal as a communication device to be used by a user operating the mobile communication terminal having transmitted the used device information, and performing connection control of the communication device.