PURPOSE: To eliminate the operation which is done by a tester, by producing simulatively input informatioon by a computer and comparing the output information delivered from a display information process system in response to the input information with the storage within a computer.

CONSTITUTION: A tester feeds a test executing procedure to a computer 6 through a keyboard 3a. Then a test start command is fed to the computer 6 through the board 3a. The computer 6 simulates the information which is produced when the tester operates a keyboard 3 and a control board 4, and this information is used as the input information. Otherwise the corresponding input information stored in an external memory 7 is applied to a display information processing system 1. Thus the system 1 delivers the output information to a CRT2. At the same time, this output information is fed to the computer 6 and then compared with the corresponding one of the output information stored previously in the memory 7. The result of this comparison is fed to a printer 8 and at the same time stored in the memory 7. The computer 6 carries out the above-mentioned process with all stored test executing procedures.