Image forming apparatus and method for controlling the same in a stepwise manner

A control unit controls a starting process and a stopping process of an image forming unit in a stepwise manner. Upon receiving an instruction for executing an image forming process during the stopping process, a determination unit inquires of the control unit about a stage of the stopping process and determines whether the stopping process in the stage is interruptible. A shutdown unit instructs the control unit to interrupt the stopping process during or after the stage, based on a result of determination by the determination unit. A start-up unit instructs the control unit to perform the starting process after interrupting the stopping process.