A sub-system determines, based on an input instruction to transition a power state of an information processing apparatus to a power saving state, a power state from a plurality of power states in which the sub-system can operate, and notifies the main system of a recovery period that corresponds to the determined power state and that the sub-system requires to recover from the determined power state. The main system determines, based on the recovery period notified from the sub-system, a power state that the main system transitions to from a plurality of power states in which the main system can operate.