In a television receiver, based on speaker information of each of one or more devices including speakers which is a memory of the television receiver, a transmitting audio signal to be transmitted to each device including a speaker, in which synchronization is established between devices including speakers in a reproduction mode, is formed and transmitted to the device (including a speaker) through a communication interface. The device (including a speaker) receives the transmitting audio signal addressed thereto through a communication interface, plays back the signal, and uses a speaker of the device to generate sound.