A game system guides operation timing of the operating section through a monitor by displaying an operation instructing indicator corresponding to the respective operation timings and an operation reference indicator corresponding to the current time in temporal order along a predetermined path on the game, and producing a relative displacement, which is along the predetermined path and is according to the progression of the time on the game, between the operation reference indicator and the operation instructing indicator in order that the operation instructing indicator agrees with the operation reference indicator at the operation timing that should be indicated by the operation instructing indicator, and changes at least either one of a starting position and a reaching position of the predetermined path.