To control a start request of an image processing device according to power condition of a plurality of image processing devices which are preset as power supply management targets, in order not to exceed an upper limit of power to be consumed by all of the plurality of image processing devices when power is supplied to the image processing device due to the start request.

An image processing device which communicates with a server device that manages power condition of a plurality of preset image processing devices, communicates with the server device by power supplied according to an instruction of a start request from a user, and inquires whether it is possible to continue the start request under the current power condition (S402 and S403). According to the power condition reported from the server device, the image processing device continues the start request (S405) or terminates the start request (S406).