The wireless communication system configured in this manner performs priority control of communication as follows: (a) A wireless relay station stores a priority table in which, from among the communications handled by the stream server, the identifiers of those communications that are relayed with higher priority are registered. (b) The wireless relay device relays communications specified by the communication identifiers registered in the priority table with higher priority than other communications. (c) The stream server receives communication start requests from any of the wireless terminals and sends to the wireless relay station communication identifiers specifying the communications that are about to be started, and requests registration in the priority table. (d) The wireless relay station registers the communication identifiers whose registration has been requested in the priority table, to an extent that a proportion S/U of a sum S of consumption bandwidths of the communications specified by communication identifiers registered in the priority table to the available bandwidth U of the wireless network does not exceed a predetermined upper limit. Thus, flexible priority control is performed, and the quality of prioritized communication can be ensured.