1. A video game apparatus for generating, and supplying to a display, an image signal for displaying a player object existing on a land object in a virtual three dimensional space by processing image data for the player object and the land object according to a program, said video game apparatus comprising: a player object image data generating means for generating player object image data to display a player object; and a land object image data generating means for generating land object image data to display a land object; wherein said land object image data includes a program control code; said video game apparatus further comprising a program control code detecting means to detect said program control code in relation to a position of the player object, and an image changing means to cause the image signal to change depending upon the program control code detected.