Provided is a game system that makes it possible for different user groups mutually to participate in the progression of a game. In a game system (1), a user terminal (8) that provides a mobile game to a first user group, a game machine (GM) that provides an arcade game to a second user group that is different from the first user group, and a center server (3) that provides a predetermined service thereto, are connected together via a network. And, upon the condition that the first user of the first user group expends a predetermined value, the game system (1) provides an advantageous situation for the arcade game to the second user of the second user group; and moreover, if a benefit condition is satisfied in the arcade game, confers a benefit that can be used in the mobile game upon the first user.