Patent ID: 8269998

Claim:
An image forming system, in which an image forming device performing image forming operation on recording paper according to printing data inputted with identification information on a user, and at least one information processing device having a display unit, are connected together so as to be capable of communication, the image forming device 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 formation operation on the basis of said data for printing to which no control command is appended, and performs image formation 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; and the information processing device having a printer driver program installed therein, the printer driver causing the information processing device to execute: display processing to display a display screen upon said display unit to receive selection input to selectively set reduction of electrical power consumption of said image forming device, and to receive setting input of authentication information which specifies a user of said image forming device; data creation processing to create, according to said selection input, either data for printing to which a control command is appended to command reduction of electrical power consumption, or data for printing to which no control command is appended; and output processing to output said authentication information which has been inputted and set, along with said data for printing to which a control command is appended or said data for printing to which no control command is appended.