System and method for synchronizing on-line game with off-line game and program recording medium

An on/off line game interworking method and system, and a program recording medium therefor are provided to connect an online game and an offline game and offer an interworking game play, thereby improving the satisfaction of a client which plays a game. A terminal transmits the unique identification information of a client to a server through a communication channel(335). A server checks online game use breakdown information corresponding to the unique identification information by connecting with an online game server and checks game use breakdown information corresponding to the unique identification information by connecting with a storage medium(345). If at least one of the online game use breakdown information and the game use breakdown information is checked, the server enables the client to play the game to which the checked online game use breakdown information and game use breakdown information is applied(360).