A reservation system for lodging has a first computer and a second computer, in which the first computer has data of available facilities and accepts user's input of lodging date and facility, and the second computer that accesses the first computer through a network and manages vacancy data of facilities. The second computer accesses a plurality of the first computers and their databases to search available facilities, and is capable of accessing other first computers for searching and reserving available facilities. Situation where reservation is not made even when a vacant room is available is prevented by accessing a plurality of the first computers.