A server determines, for each of a plurality of repeaters, a terminal apparatus to be connected, and a connection order in which a plurality of repeaters connect to the terminal apparatuses to be connected, based on a latest upload time of each detection data generated by the plurality of terminal apparatuses, and identification information of a plurality of terminal apparatuses, so that detection data is preferentially acquired from a terminal apparatus that generated detection data of which the upload time is early in the information processing system. When each of the plurality of repeaters receives, from the server, the identification information of the terminal apparatus to be connected and the connection order information thereof, the plurality of repeaters connects to the terminal apparatuses to be connected according to the order indicated by the connection order information, and acquire detection data therefrom.