A sound accessory device is provided. A receiving unit of the sound accessory device receives a first sound from a first external device. A sound output unit outputs a first sound. A sensing unit senses a second sound for triggering an output control of the first sound from outside. A control unit controls the output of the first sound, if the second sound is received. The sound for triggering the output control of the first sound includes at least any one selected from a specific word, a voiceprint representing a speech of a specific person, a horn of a vehicle, an alarm sound, a notification sound of an external device, a sound of an animal, and a doorbell sound.