Abstract: In an admittance management system, an admission ticket to a security area is issued, biometric information of a person who has performed an issuing procedure of the admission ticket is acquired as first biometric information, biometric information of a person who has approached a gate provided at an entrance to the security area is acquired as second biometric information, a judgment is made upon whether the biometric information of the person who has approached the gate and the biometric information of the person who has performed the issuing procedure of the admission ticket do not correspond to the same person, and the person is allowed to pass through the gate when it is determined that the biometric information of the person who has approached the gate and the biometric information of the person who has performed the issuing procedure of the admission ticket correspond to the same person.