Patent ID: 7565561

Claim:
An information processing apparatus that operates in a normal operation state or in an energy-saving state in which power consumption is lower than that in the normal operation state, comprising: a communication unit configured to communicate with an external device; a voltage supply unit configured to supply voltage to said communication unit, the voltage supplied by said voltage supply unit being supplied from said communication unit to the external device; a control unit configured to control the voltage supplied by said voltage supply unit to said communication unit through a resistor in a case where the information processing apparatus is operating in the energy-saving state, and control the voltage supplied by said voltage supply unit to said communication unit without using the resistor in a case where the information processing apparatus is operating in the normal operation state; and a detecting unit configured to detect a voltage drop in response to connection of the external device to said communication unit when said voltage supply unit supplies the voltage to said communication unit through the resistor, wherein said control unit is further configured to control the information processing apparatus to shift from the energy-saving state to the normal operation state in a case where said detecting unit detects the voltage drop.