An image forming apparatus is capable of easily changing a scheduled stacking position of any image forming job. An image region in which an overall arrangement mode of the image forming apparatus and sheet discharge apparatus is displayed and a list region in which standby jobs are listed are displayed on a monitor screen. In the image region, a sheet bundle of the selected standby job is displayed on a tray that is set as the scheduled stacking position of the selected standby job. When the sheet bundle is selected and dragged and dropped by a mouse pointer on the monitor screen, the tray being set as the scheduled stacking position is changed, and a position at which the sheet bundle is displayed is also changed.