An audio device includes a connector to which a headphone or an earphone is connected, a receiver receiving a radio signal that is converted from an audio signal corresponding to video to be displayed at another device, a controller selecting music data or the received radio signal, and a second audio processor switching between conversion of music data to an audio signal or conversion of the received radio signal to an audio signal based on selection by the controller, and providing the converted audio signal to the headphone or the earphone via the connector.