An information processing method includes selecting at least one character from a plurality of characters possessed by a user according to the user's operation, adding an attribute related to an additional character to the selected character, causing one or more of the plurality of characters possessed by the user to appear in a game, and executing the game, and if the characters appearing in the game include the additional character and the selected character having the added attribute, changing a setting in the game such that an advantage is given to the user.