An image forming apparatus according to the present invention is capable of connecting a removable storage device that stores operation data controlling an operation of the image forming apparatus. When a shutdown instruction of the image forming apparatus is received from a user, it is determined whether or not it is necessary to execute an operation using the operation data stored in the removable storage device. In a case that it is determined that it is necessary to execute an operation using the operation data, the image forming apparatus stores the operation data stored in the removable storage device into an incorporated non-volatile storage unit and shots down, and then restart. After the restart is performed, it is controlled so that an operation using the operation data that has been stored in the incorporated non-volatile storage unit is executed.