A wireless network system is provided in which time periods during which packets are transmitted or received for bandwidth allocation request and acknowledgement over a network are separately set in a superframe period, and data is transmitted or received through the bandwidths allocation. The wireless network system includes a frame-generation unit which generates a beacon frame for constructing a superframe including one or more channel time blocks, a bandwidth-management unit which sets among the one or more channel time blocks first channel time blocks as a bandwidth allocated period for a particular station on a network and second channel time blocks as packet transmission or reception periods for a bandwidth-use-request packet on the network, and a communication unit which transmits the beacon frame including reservation information for setting the first and second channel time blocks through a communication channel.