A wireless communication system that detects a position of a node using an appropriate position detection method. The invention is based upon a wireless communication system provided with a plurality of nodes that mutually communicate and a server that detects a position of the node using communication between the nodes and is characterized in that the node has a battery for supplying power, measures the status of the battery, notifies the server of the measured status of the battery, the server determines a position detection method of the node based upon the status notified by the node of the battery and calculates a position of the node by the determined position detection method.