To flexibly and easily adapt to conditions in a screen, and perform an optimum command selection and an optimum operation.

When a definite operation for executing a command is not performed, a command to be displayed is determined according to a variety of acquired information, after the nonperiodical acquirement of information which indicates conditions of action of a player character (a command in execution or an immediately preceding executed command), information which specifies an acting ability of the player character, information which indicates a distance to a target (an object to be captured), positional information which indicates the present position of the player character, and the like. Consequently, the command is displayed in a prescribed position, and when a command display is switched, an icon corresponding to a newly displayed command is displayed as a hint near the player character.