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.