In a reservation between users, a voice call is efficiently realized and security is improved by, for example, establishing a call using a temporary telephone number by associating the reservation information with a temporary telephone number prepared in advance. A personal information storage unit that stores personal information including a link between a personal identification number that can identify an individual and an actual telephone number assigned to each terminal owned by the individual, and a reservation that can identify a reservation Reservation storage unit for storing reservation information including association of identification number and personal identification number in storage areas with different access authority levels, and based on the reservation information and personal information, A generation unit that generates association data with a telephone number, valid identification information that identifies the validity of the association data, a temporary phone number that is prepared in advance and can be used temporarily is set, and the sender's terminal When the call connection request including the temporary phone number is received, the call connection is performed when there is valid association data corresponding to the temporary phone number. [Selection] Figure 2
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