Provided is an incentive granting device, comprising: a second game notifying unit 16 which notifies an existing user of the existence of a second game during the execution by the existing user of a first game app; an introduction code issuing unit 18 which issues an introduction code during the execution of the second game app by the existing user who has received the notification; and an incentive granting unit 20 which grants a prescribed incentive for the existing user's first game, with respect to a new user receiving an introduction from the existing user and downloading the second game app. By allowing an existing user to be aware of the existence of a second game during the execution of a first game, and to obtain an incentive for the first game by executing the second game and introducing a new user thereto, the existing user is given a motivation to proactively spread the word about the second game.