PURPOSE: To simplify the production of conventional conditional code part and to increases the processing speed, by inputting the mode information representing the state of program execution and the flag output by arithmetic logical operation unit to the associated memory.

CONSTITUTION: In renewal of the program status word 1 performed in every execution of instruction, the information of the mode register section 3 representing the environment of the program execution of the word 1 and the flag output of the flag register 8 by the arithmetic operation logical unit 7 are inputted to the associated memory 9. Further, the format of the word 1 is converted with this memory 9. Thus, the production of the conventional condition code is simplified especially to the program status to increase the processing speed.