A game apparatus includes an LCD, and on the LCD, a touch panel is set. When a player object encounters an enemy object, a battle screen is displayed on the LCD. A player performs a sliding operation on the touch panel with a stick or the like in such a manner as to surround the enemy object and tries to obtain the enemy object. At this time, when the enemy object (affecting object) already obtained is selected, an ability (effect) equipped with the affecting object can be produced. For example, a flame according to a surrounding line is generated. When the flame hits the enemy object, the enemy object is damaged to decrease its moving speed and stop moving.