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0001) 1. Field of the Invention 0002 The present invention relates to a real-time proces Sor System and a control method thereof in environment where a plurality of bus masters arbitrate and use a bus. 0003 2. Description of the Related Art 0004 Conventionally, in providing real-time guarantee for Software in environment where there is only one pro ceSSor as a device that works as a bus master, the real-time guarantee is afforded by assigning priority per unit of processing and appropriately Scheduling Starting order for the processing.

0005 For example, reference 1 (“HARD REAL-TIME COMPUTING SYSTEM, Predictable Scheduling Algo rithms and Applications”, written by Giorgio C. ButtaZZO, Fourth Printing 2002, Kluwer Academic Publishers, pp. 109 146 and pp. 149-178) discloses, in pages 109-146, that when fixed priority is given for each processing, a method that assigns higher priority to processing with …