1. A CPU usage time counting method for counting an actual usage time of each CPU in a computer system which includes a display device and a recording device and executes distributed processing of each of a plurality of jobs input to an integration network, to which a plurality of CPUs and at least one memory are connected, by using said CPU and the memory, comprising: counting a CPU usage time, provided in basic software of said computer system, used for each job, and storing a counted result in said memory; counting a memory access wait time, obtained by subtracting a memory access time of a highest speed job in hardware design of the computer system from the memory access time of a job executing in a CPU, including the processing wait time of the CPU, when each CPU accesses the at least one memory via the integration network during execution of each job; setting a corrected CPU usage time, calculated by subtracting said memory access wait time of each CPU from the CPU usage time for each job, as an actual CPU usage time; and outputting a display output and a recording output of said corrected CPU usage time to the display device and the recording device according to a request from a corresponding job.