To provide a game machine system which is formed by connecting a home game machine to a host computer via a communication channel etc. and in which commercial advertisement can be incorporated into game software.

This game machine system has transmitting side equipment, one or more receiving side game equipment, and a communication channel to connect those. The transmitting side equipment has a memory device to store fixed data relating to the main program of the game software, memory device to store variable data relating to the commercial advertisement of the game software, and a means to properly switch and transmit the fixed data and the variable data. The receiving side equipment has a memory means to store the fixed data and the variable data to be transmitted. By transmitting the fixed data and updated variable data of the game software to the receiving side game equipment from the transmitting side, an image based on the always latest variable data appears on a part of a game image.