An image forming apparatus which executes a program and updates the program, and is provided with an updating part configured to store a program prior to updating or a copy of the program prior to the updating and to generate an updating program by executing an updating process of the program, to thereby set the updating program as a boot target, a boot judging part configured to judge whether or not a booting of the updating program was successful and to record information indicating a result of judgement in a storage part, and a restoring part configured to confirm whether or not the booting of the updating program was successful based on the information, and to set the stored, program prior to the updating, as the boot target, if the booting of the updating program failed.