to be adjusted the psw set in the simulation model indicates the instruction b subsequent to the instruction a when the computer to be adjusted stops all the records of the logical expression table 404 whose flag 504 is at 34 1 34 i e the records corresponding to the registers of the computer 101 are registered in the event table as shown in fig1 at a step 705 this event table is shown in fig1 the event table is composed of records for storing the time periods and the logical gates and stores the names of the logical gates and the number of execution cycles i e the time points when an instruction is executed in the simulation model in case the outputs of the logical gates vary here the registration in the event table is to store the register names of the computer to be adjusted in the event table in the example of fig3 the registers 10 and 15 are registered as the logical gate names and the execution cycle number is at 34 0 34 because no instruction is executed yet in the simulation model next the records are fetched one by one from the event table at this time it is judged whether or not all the records have been processed on the basis of the logical gate.