A DB registration-updating unit registers, in a patron management DB, the behavior history of each player in association with camera IDs that identify the cameras that have captured images of the player. On the basis of information in the patron management DB, a potential player-determining unit considers a player, whose length of stay in a specific corner is longer than a prescribed period and who is not playing, to be a potential player who wants to play but is unable to play. An attention level DB management unit registers, in an attention level DB, the points proportional to the lengths of stay of potential players in said corner as the attention level by cumulatively storing the points for each game console. An attention level display control unit displays the information on the players' attention level that is registered in the attention level DB.