Abstract: A hotel room marketing and operating system includes a room-selling server for providing the room vendee with room-selling information related to the plurality of rooms of the hotel or the residence; an operation server for receiving the room-selling information on the rooms from the room-selling server, calculating a sales amount of a room of each room vendee based on operation information for marketing and operating the hotel rooms and providing a result of calculating the sales amount of each room; requesting and receiving sales and operation information and a result of calculating a sales amount of a room purchased by the vendee.