Patent attributes
When a player sets an acquisition target item to be an item he or she wants at a timing of creating a plan, actually required points that are required for acquiring the acquisition target item is determined. Then, options of the advertisement plan in which one or a plurality of advertisements are listed so that watching points reaching the actually required points can be acquired, from options of advertisements that can be watched in exchange for the watching points. When any of the plans is selected and confirmed, an advertisement is displayed based on the plan, and the watching points are given to the player. When the sum of the watching points given reaches the actually required points, the acquisition target item in the plan is given to the player.
