PURPOSE:To grasp the states of plural processors just with a single terminal equipment by incorporating a debug monitor into a host computer to ensure the unitary control of the debugger main bodies stored in all programs when plural programs that work in parallel with each other via plural processors are debugged. CONSTITUTION:A debug file input/output instruction, a defining instruction and a debug area setting instruction are supplied to a terminal equipment 14 regardless of the operations of processors 21-25 and the memory contents. Under such conditions, only a debug monitor 13 incorporated in a host computer 11 performs the processing and requests a user to deliver the next debug instruction. A monitor 13 informs the debug instruction supplied to the equipment 14 to the corresponding processor as long as said debug instruction is equal to a designating instruction for the number of the processor to be noticed. Then the monitor 13 turns on the flag of a debugger main body 31 put into the processor and reports the end of operation to the monitor 13. The monitor 13 displays the processor number designated to the equipment 14 and a list connected to said number and requests the next debug instruction to the user to repeat this action.
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