An information request describing an attribute of necessary data is distributed from a center server to a mobile terminal via an edge server; the mobile terminal transmits data, which is requested in the information request, to the edge server; the edge server notifies the center server to the effect that the data, which is requested in the information request, has been acquired; the center server distributes, with respect to data acquired by the edge server from the mobile terminal, non-necessity information indicating that collection of the data is unnecessary to the edge server and to the mobile terminal via the edge server; and when the mobile terminal receives the non-necessity information, the mobile terminal suspends acquisition of data, of which collection is deemed unnecessary in the non-necessity information, and, when the data is stored, discards the data.