Patent ID: 7334146

Claim:
An image processing apparatus that performs image processing based on image data inputted thereto, comprising: a controller that controls the image processing apparatus, said controller determining whether or not the image processing apparatus should be switched from a first power supply status to a second power supply status in which power consumption of the image processing apparatus is lower than in the first power supply status; a holding unit that is responsive to a determination by said controller that the image processing apparatus should be switched from the first power supply status to the second power supply status, for holding information indicative of whether or not the image processing apparatus has been switched to the second power supply status; a first storage unit that stores control data based on which said controller controls the image processing apparatus, said first storage unit being non-volatile; a second storage unit that stores the control data read out from said first storage device, said second storage unit being volatile; an input unit that inputs image data from an external device; and a switching unit that is responsive to the determination by said controller that the image processing apparatus should be switched to the second power supply status, for switching a power supply status of the image processing apparatus such that power supply to said controller is shut down, wherein: said switching unit switches the power supply status such that the power supply to said controller is resumed, in response to the input of the image data, and said controller is responsive to the resumption of the power supply to said controller, for reading out the information from said holding unit, said controller reading out the control data from said second storage unit in a case where the information indicates that the image processing apparatus has been switched to the second power supply status, reading out the control data from said first storage unit in a case where the information does not indicate that the image processing apparatus has been switched to the second power supply status, and controlling the image processing apparatus based on the control data.