To prevent the damage of a data file by finishing the execution of a process when a fault detecting means detects a fault, by which it is difficult to continuously execute the process, or when the report of execution end is received from a process managing means.

The data processing process 350 detects a fault such as data processing error or communication error generated during the program execution by a fault detecting means 351 and reports the conditions of the fault based on that detection to a process managing means 340 by a message transmitting means 352. Besides, when it is made difficult by the fault to normally execute a program, the execution of the program is finished by a process end processing means 353. Thus, when the fault is generated, the execution of the data processing process 350 can be automatically stopped and the damage of the data file can be prevented.