A checking unit configured to check whether or not each of the plurality of storage devices is a speed-changeable storage device capable of processing data at a plurality of rotation speeds, and a control unit configured to set a storage device among the plurality of storage devices that is checked to be the speed-changeable storage device to a first state operating at a first rotation speed that is a first threshold or less in a case where a data access to the storage device does not occur are included, whereby effective power saving can be realized in a simple manner.