Patent ID: 8862911

Claim:
An information processing apparatus comprising: a processing unit; a power supply control unit configured to control power supply to the processing unit; and a controller unit configured to access the processing unit irrespective of a power supply state of the processing unit, wherein the power supply control unit is configured to power off the processing unit that is not in use, wherein the power supply control unit is configured to, in a case where the controller unit accesses the processing unit that is powered off, power on the processing unit and output a predetermined control signal to the controller unit, and wherein the controller unit is configured to recognize that an error occurs if the controller unit does not receive a response from the accessed processing unit before a first time-out time elapses in a case where the predetermined control signal is not received, and to recognize that the error occurs if the controller unit does not receive the response from the accessed processing unit before a second time-out time longer than the first time-out time elapses in a case where the predetermined control signal is received.