PURPOSE: To proceed with the initialization processing of a peripheral equipment without delaying the original activation processing of a system by executing the initialization processing of the peripheral equipment in parallel as a processing different from the main processing of the system.

CONSTITUTION: When the initialization processing of the peripheral equipment except a central processing unit is necessitated, the initialization of the minimum hardware and software necessary for the rising of the OS of the system is operated by a system basic initialization processing 31. Then, at the time of activating a multi-task OS by an OS activation 32, a peripheral equipment initializing task 34 is activated as the processing different from the main processing, a system initialization processing 33 is operated by the main system without waiting for the end, and an application system 35 is activated. Thus, the initialization processing of the peripheral equipment is operated by a multi- task different from the main processing, so that the main processing of the system can be prevented from being delayed by repeating retry in the initializing task even at the time of failing in one initialization processing.