PURPOSE: To shorten the debugging time by producing a received data history file where a process controlling plural processes stores the data received from each process and re-executing artificially the stored data as the data received from each process.

CONSTITUTION: A control process 1 is provided to control all processes together with the processes 5-7 forming an application soft, and a received data history file 8. In a received data history storing phase, the data received from the processes 5-7 are transmitted and processed in accordance with each transmission destination. Simultaneously, the received data are stored in the file 8. In an automatic execution phase, the received data are received from the file 8 instead of the processes 5-7. These data are sent to each transmission destination and therefore the precedent processing is carried out. Thus a relevant phenomenon can be re-executed by reserving a received data history when an abnormal action occurs. Then the debugging time is shortened.