PURPOSE:To omit the waiting time of a main CPU by changing the starting order of sub-CPUs according to the starting propriety of the sub-CPUs when these sub-CPUs are started by the main CPU. CONSTITUTION:A main CPU 1 starts successively the sub-CPUs 4, 6 and 8. If one of these sub-CPUs could not be started since it is under processing, this sub-CPU is skipped and the next sub-CPU is started. At the same time, the starting order of the skipped sub-CPU is changed and recorded in a memory 2. The subsequent sub-CPU 4, 6 and 8 are started in the order recorded in the memory 2.
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