Multiple-CPU system and its control method

The disclosed multi-CPU system comprises: a main CPU, at least one auxiliary CPU, the connected interface devices for communication, and the management unit coupled between the main CPU and auxiliary CPU to manage auxiliary CPU. The opposite control method comprises: initialing the main CPU while Forbidding auxiliary CPU; enabling the auxiliary CPU to enter normal state; if failed, only resetting the auxiliary CPU; or else restarting the system if the main CPU failed. This invention can improve system reliability.