To provide a telephone device that rings a ringing tone to an incoming call from a specific caller even in a state that a silent mode, in which a ringing tone is not ringed when a call comes in, is set.

Even in a state that a silent mode, in which a ringing tone is not ringed when a call comes in, is set, a telephone device 100 rings to an incoming call from a specific caller number registered in a database 112 which is ringing number registration means, a control unit 105 automatically registers the caller number in the database 112, or automatically deletes the registered caller number on the basis of whether a user of the device 100 performs off-hook operation to the incoming call.