The image forming device of this invention includes a control unit and a storage unit. The control unit determines whether or not data for printing which has been inputted while the power save mode is being executed is data for printing to which a control command is appended that commands the reduction of electrical power consumption. If it is data for printing to which a control command is appended, then the control unit does not execute any image forming operation, but instead stores this data for printing with control command appended in the storage unit. However, if data for printing to which no control command is appended is inputted, then the control unit changes over to the operating mode and, after having performed image forming operation for this data for printing to which no control command is appended, performs image forming operation for that data for printing with control command appended within the storage unit, which has the same identification information as the data for printing to which no control command is appended.