SOUND OUTPUT APPARATUS, SOUND OUTPUT CONTROL METHOD, VEHICLE, AND LOCKING AND UNLOCKING SYSTEM

A sound output apparatus and a sound output control method including a sound output controller placed in a vehicle having a door lockable and unlockable based on the result of communicated with mobile terminals are disclosed. The vehicle mounted with the sound output controller and a locking and unlocking system including the vehicle are also disclosed. The sound output controller outputs a sound that is different between when the door is unlocked by a specified mobile terminal and when the door is unlocked by other means.