Patent ID: 8537378

Claim:
An image forming device which performs image forming operation upon recording paper on the basis of data for printing which has been inputted from an external device along with identification information related to a user, comprising: a control unit which controls image forming operation so as selectively to execute either an operating mode in which the state of electrical power consumption is such that image forming operation can be executed, or a power save mode in which the state of electrical power consumption is lower than during image forming operation; and a storage unit which stores data for printing which has been inputted while said power save mode is being executed, and to which a control command which commands reduction of electrical power consumption is appended, along with said identification information; wherein said control unit, when data for printing to which no control command is appended is inputted while said power save mode is being executed, changes over from said power save mode to said operating mode, performs image forming operation on the basis of said data for printing to which no control command is appended, and performs image forming operation on the basis of, among the data for printing which is stored in said storage unit, that data for printing with the control command which has the same identification information as said data for printing to which no control command is appended.