In a game system, at least two of objects are set as selected objects. First, a virtual frame (a first frame 77) perpendicular to a line of sight is set on a frame setting plane 76. The first frame 77 is set so that selected objects 81 through 84 are positioned inside of the first frame 77 when viewed from a direction of the line of sight. Furthermore, the first frame 77 is deformed in accordance with movements of the selected objects 81 through 84. Specifically, when all of the selected objects 81 through 84 are a predetermined distance away from one side of the frame 77 when viewed in the direction of the line of sight, the side is moved toward the inside of the first frame 77, thereby deforming the first frame 77.