To maintain favorable sound reproduction. In a car audio apparatus 6 which includes an inter-equipment communication unit 51 configured to perform communication according to each of a plurality of sound communication protocols Pv for transmitting a sound signal A3 of audio, and a reproduction processing unit 52 configured to reproduce the sound signal A3 received through the communication, and which receives the sound signal A3 from a smartphone 8 through communication according to any of the sound communication protocols Pv, the car audio apparatus 6 includes a priority storing unit 62 configured to store a priority of the sound communication protocols Pv in advance, and a sound signal input controlling unit 53 configured to, in the case where a sound communication request for transmitting the sound signal A3 is received from the smartphone 8, accept the sound communication request according to the priority of a sound communication protocol Pv of requested communication.