PURPOSE: To attain the macro description suited for the generation of a program by defining the relation with a virtual parameter with the introduction of a virtual parameter description sentence and, at the same time, to attain an interactive check of a real parameter after obtaining the real parameter out of a picture plane.

CONSTITUTION: A program pattern 1 written in the macro description is read by a reading part 2. A virtual parameter description sentence read discrimination part 3 detects selectively a virtual parameter description sentence and sends an acceptance instruction to a real parameter screen transmission/reception part 6. Then the part 3 transmits a screen to a display part 5 for acceptance, and a user selects a real parameter among those corresponding to virtual parameters. The input parameter is received by a transmission/reception part 6 and sent to a real parameter check part 7. The part 7 checks whether or not the received parameter is corresponding to a desired real parameter. The parameter passed this check is held at a real parameter holding part 8. A macro development part 9 uses the real parameter held at the part 8 to give macro development to a program pattern held at a program pattern holding part 4 and sends a source program produced at a source program output part 10.