PURPOSE: To establish the guarantee of the quality of the software, by adding a check display section to each table among an instruction corresponding table group wherein a source module instruction number is corresponded with a load module.

CONSTITUTION: When a test data is inputted from a test data input section 5, a load module relating to the data is executed. An execution monitor section 8 retrieves the corresponding number table groups CT1, CT2 in an execution management file 7 from the instruction number of a corresponding source module, and sets a flag executed to a check display section (f2) accompanied with the retrieval table, e.g., the CT2. Once the execution of the test is finished, the presence/absence of the flag executed of check display groups f1, f2, and f3 in the file 7 is checked and the source module instruction number without the flag is printed 6 for listup. Only when the source module instruction number not executed is listed up, the test data relating to the number is additionally inputted and the execution of test is again continued.