To solve the problem that a user does not notice an incoming call even if there is the incoming call since vibration is not sufficiently transmitted to the body even if the vibrator operates and a housing vibrates when a cellular phone is put in a pocket, and to make it easy for the user to notice the vibration when the vibrator built in a portable terminal operates.

In this vibrator control system, a detection means 6 for detecting sound and the vibration is attached to a device with a built-in vibrator, and when the vibrator 5 operates, the detection means detects the sound and vibration generated when the housing contacts an external object. Vibrator output is controlled to make it easy for the user to notice the vibration based on the detected information.