To provide a reservation service capable of using parking lots which links with regional use facilities by using a network and an information system and is not known even to a user.

This system comprises a terminal T operated by the user, a regional parking lot reservation center device C and a plurality of parking lot devices P1, P2,..., and has a parking lot/regional linking information DB C-1, a parking lot/full or vacant information DB C-2 and a parking lot reservation DB C-3, when the user inputs a regional use facility name being a target from the terminal T, the device C retrieves the DB C-1 and selects a parking lot convenient the use facility, retrieves the DB C-2 to check whether or not an empty parking space exists, stores the selected results in the DB C-3 when the empty parking space exists and also notifies the user of reservation results through the communication network N.