An information processing system transmits, via a first network, connection information for a second network that is different from the first network to a plurality of terminal apparatuses; carries out communications with the terminal apparatuses via the second network based on the transmitted connection information; stores respective items of terminal identification information for the terminal apparatuses, with which the communications are carried out via the second network; determines whether the terminal apparatuses that are identified by the stored items of terminal identification information can carry out communications via the second network; and, when determining that the terminal apparatuses cannot carry out communications via the second network, carries out such control as to prevent the second network from being used to carry out communications.