1. An acoustic apparatus mounted on a vehicle driven by a driver comprising: acquiring means for acquiring a gaze point at which the driver gazes while driving the vehicle, the gaze point reflecting parameters including a location of the vehicle, a running state of the vehicle, and a running environment of the vehicle, and acquiring a future gaze point existing at a future time, the future gaze point reflects the parameters at a time delayed by a predetermined period from a time when the gaze point is acquired or the parameters at a time when the vehicle reaches a location a predetermined distance away from a location where the gaze point was acquired; generation means for generating sound images in the vehicle; and localization means for localizing the sound images to be at the gaze point and at the future gaze point.