To appropriately control the cooling of electronic equipment incorporating a plurality of power units and, at the same time, to suppress the unprepared production of noise.

A controller for controlling cooling of power source is provided with a number of incorporated power sources detecting sections 110 which detects the number of power units 130 incorporated in electronic equipment, and a cooling control section 120 which controls the drive of cooling fans 132 correspondingly to the power units 130 in accordance with a detect signal 110a from the detecting section 110, and controls the cooling of the incorporated power units 130 in accordance with the number of the units 130.