A plurality of radio-frequency identification tags for corresponding items are read as a group to provide corresponding group information. The cyclone condensing apparatus includes an air inlet connected to the upper part of a casing having a conical shape along a tangential direction; an air outlet disposed along the central line of the casing, and a plurality of cooling water spray nozzles disposed along the circumferential direction of the casing. The performance indicator is then monitored, and the network performance rule is evaluated on a regular basis based on the performance indicator. A request to access a wireless network is received from the owner of the mobile electronic device.