A medium storing a program that causes a computer to execute a process includes receiving first pieces of terminal identification information and a request for updating second pieces of terminal identification information included in management targets to the first pieces of terminal identification information, comparing the second pieces of terminal identification information with the first pieces of terminal identification information, transmitting information including at least one of a first number of terminals to be excluded from the management targets by executing a update regarding the request, a second number of terminals to be added to the management targets by executing the update, and a third number of terminals that are included in the management targets before and after executing the update, and when receiving an instruction to execute the update regarding the request, updating the second pieces of terminal identification information to the first pieces of terminal identification information.