A mobile telephone performs communication by transmitting voice, which is inputted by a speaker into a communication apparatus having a floor, via a server, to one or more communication devices of one or more listener(s) having no floor. A transmitter transmits a request signal, which requests an acquisition of a floor, to the server (Step S104) when a predetermined operation is performed by a user (Step S103: YES). A receiver receives both a permission signal, which is transmitted from the server in response to the request signal for permitting the acquisition of a floor, and numerical information, which is transmitted from the server, indicating the number of communication apparatuses of the listener(s) (Step S101 and S106). An informing control subunit performs different informing controls in accordance with the number indicated by the numerical information when the receiver receives the permission signal (Step S107 to S109).