To monitor using of illegal paper moneys based on an authentic paper money judging program and to speedily update the authentic paper money judging program.

An inter-machine apparatus 13 receives feeding of a paper money by a player, extracts feature information of the fed paper money, and judges whether the money is authentic and whether the money is not authentic based on the feature information. A movement line management server 18 obtains the position of the player as positional information, and stores the obtained positional information. When both of the authentic paper money judgments about whether the money is authentic and whether the money is not authentic are negative, a monitoring control server 21 controls a camera 22 and takes an image of an area corresponding to the positional information of the player who has fed the paper money among the pieces of positional information stored in the server 18. This invention can be applied to an illegal paper money judgment system.