In a video game that progresses a game using a limited number of items, the game can be made more interesting. In an area data table 126-1 of a first area, a brand ‘CAT’ having a previous brand point ‘14%’ is ‘BEST 1’, and a brand ‘BOAR’ having a previous brand point ‘13%’ is ‘BEST 2’. In addition, a brand ‘TIGER’ having a previous brand point ‘3%’ is ‘WORST 2’, and a brand ‘RAT’ having a previous brand point ‘2%’ is ‘WORST 1’. Accordingly, if a player character executes a battle against an enemy character in the first area, when an item of the brand ‘CAT’, which is ‘BEST 1’, is used, its power becomes three times higher than a reference power, and when an item of the brand ‘BOAR’, which is ‘BEST 2’, is used, its power becomes one and half times higher than the reference power. In addition, when an item of the brand ‘TIGER’, which is ‘WORST 2’, is used, its power becomes 0.5 times lower than the reference power, and an item of the brand ‘RAT’, which is ‘WORST 1’, becomes unavailable.