IMAGE FORMING APPARATUS WITH CONTROL FOR INTERRUPTING AN IMAGE FORMATION JOB, METHOD OF CONTROLLING SAID IMAGE FORMING APPARATUS, AND STORAGE MEDIUM WITH A PROGRAM STORED THEREON FOR PERFORMING IMAGE FORMING APPARATUS CONTROL

An image forming apparatus has a feeder for feeding a sheet, an image forming unit for performing an image formation job so as to form an image on a sheet fed from the feeder, a controller for interrupting a current image formation job, performing an interrupt image formation job, and resuming the current image formation job after completion of the interrupt image formation job. When the current image formation job uses a sheet feeder for feeding sheets set in a predetermined order, the controller prevents the sheet feeder used in the current image formation job from being used in the interrupt image formation job.