A program has routines S3, S4 of computing an attack form AP of a first character 22 on the basis of an instruction by a player, a routine S4 of computing and displaying an attack probability AR according to the instruction of the attack position by the player, a routine of automatically proceeding a game after the attack form is computed and set, and routines S5, S6, S13, S14 of controlling to display an attack action and a defense action of a ball by the first and the second characters with a series of pictures in the routines. After the player instructs the attack form, the attack action and the defense action of the ball are displayed with a series of pictures. The player can concentrate on the instruction action of the attack form, and can enjoy a brain play.