The present invention relates to a reservation server which comprises a retaining section for retaining store/facility information including a reservation-needed service and a reservation situation, a network terminal for outputting alternative event substituting for the service, a receiving section for receiving a desired service, a reservation managing section for selectively reading out the store/facility information and the alternative event, and a transmitting section for transmitting the information and event. Accordingly, a service provider can notify a user of a service and reservation situation of a store-near the user or the start/end time of the service, and the time to be taken for the service and can suggest an alternative event in a time zone convenient to the user.