A server of offering a reservation service is provided to effectively minimize waiting time by being able to reserve several rides with a portable information terminal and checking up a waiting state of the reserved rides through the information terminal. A server for offering reservation service includes that is able to do wireless communication with a large number of information terminals in a restricted region through an AP(Access Point) includes a reservation storing part(310), a registering part(300) for waiting people and a message processing part(320). The reservation storing part stores identification information of the information terminals of the waiting people registering reservation about several rides. The registering part for waiting people registers as the waiting people of the rides in the reservation storing part by acquiring the identification information of the information terminal needed to reserve rides. The message processing part makes an alarm message of a waiting state about the reserved rides for the waiting people registered in the reservation storing part and sends the created alarm message of the waiting state to the information terminal of the waiting people.
