The present invention relates to a version revision control system of VSI, which is particularly useful when a bug is found in the system program or an improved version upgrade after the VSI set including the VSI microcomputer is shipped. In order to improve the service quality of the VSI system, it is possible to provide a modified version of the upgraded program to the user by using a computer or a computer communication network.;According to the present invention, the system is connected to the communication port 12 of the VSI part 1 so as to realize the above object, and writes a program in the YPIROM memory 13 of the VSI part 1 or the data communication part 3. A program personal computer 2 for transmitting the modified program data to the user side computer 34 by using the telephone network 31; A VSI part 1 including a communication port 12, a microprocessor 11, an YPyrom memory 13, and the like so as to be connected to the program personal computer 2; The program personal computer 2 provides a version revision control system of VSI consisting of a data communication unit 3 including a user-side personal computer 34 or the like which receives correction program data through a telephone network 31.
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