Triangular relation is introduced such that a vertical-attribute attack B1 (first action) is more advantageous than a horizontal-attribute attack B2 (second action); the horizontal-attribute attack B2 is more advantageous than a movement action B3 (third action); and the movement action B3 is more advantageous than the vertical-attribute attack B1. If the vertical and horizontal attribute attacks occur at the same time, hit check is carried out using pseudo hit areas each of which is larger then than hit areas specified by the orbits of attacks, the amount of axis following compensation for character is set to be larger, or the judgment of hit is canceled even when the attacks hit against each other. If an attribute parameter (or difficulty level setting) for any one of the vertical-attribute attack, horizontal-attribute attack, and movement action is changed, the attribute parameters for the other actions are also changed at the same time.