PURPOSE: To improve the reliability of a program correction system by providing an area in the system to control various information for each patch, applying the numbers in accordance with the patch writing processes, and changing the state No as the writing procedure proceeds.
CONSTITUTION: The patch information 121 on a buffer area 12 is stored in a patch area 132 included in a program area 13 and updated into a number corresponding to the state control information. Then a patch area writing means 112 drives a working data reading means 113. The means 113 reads out the corresponding data on a relevant program to be changed through a patch area under working and stores the data in a saving area 122. Then a program writing means 114 is driven to build the program of the patch area into the relevant program, and the correction is carried out so that the relevant program is skipped to a patch program. Then the information 121 and the old data on the area 122 are stored in a logging information store part 15.
IWASA MITSURU
YURA SHINSUKE
FUJITSU COMMUNICATION SYST
FUJITSU TOHOKU TSUSHIN SYST KK