In a case of operating a wireless LAN system for covering a wide-range area employing a plurality of APs (Access Points), propriety of a coverage range of the AP is visually displayed together with its influence range on an area map with an operational situation based upon a load situation, an interference situation, a utilization situation of a channel, etc. reflected.
Various kinds of operational information of a wireless appliance in a cell of each of APs 4a to 4c is collected by a managing server 1, and also, a cell boundary of each AP is determined by a cell boundary server 2. And, the managing server 1 works/computes the collected operational information, and finds the operational situation in each cell. And, a displaying apparatus 3 partitions a service area of the wireless LAN system with a cell boundary, and makes a display so that a display aspect thereof differs responding to the operational situation for each cell found in the managing server 1. This allows the display aspect that coincided with the operational situation to be obtained, thereby making it possible to display propriety of the operational situation for each cell coverage range by coverage range of the AP.