To provide an image-processing apparatus for improving the storage property of an image that has been picked up even when the remaining capacity of a battery is lowered than a normal operation limit, and to provide the power control method in a photograph mode.

The image-processing apparatus 10 supplies a control signal 120 from a CPU 12 in a photograph mode that has been decreased from a specific operation limit voltage, generates a clock signal 140 that operates slower than normal power feed by the supply using a clock generation section 14, sets one by one successively from an image processing section 22, a compression/expansion processing section 24, and an output interface section 26 to a processing target, and supplies an operation clock 140 that is slower than normal power feed to the processing target via a clock selection section 16.