A program in the present invention causes a computer to perform: performing a first process for performing a predetermined process related to an aircraft boarding procedure and acquiring boarding reservation information on a user; when the process is completed, performing a second process for matching biometric information acquired from the user with passport biometric information included in passport information acquired from a passport of the user and, when a result of the matching of the biometric information with the passport biometric information is that the matching is successful, associating the passport information, the biometric information, and the boarding reservation information with each other; and performing a switching process for switching whether to perform the first process or the second process.