A method, medium, and system estimating a location of a node, whose location is unknown, in a communication system including both nodes having known locations and nodes having unknown locations. A first packet is transmitted and received between nodes having known locations, via a node having an unknown location to be estimated. A second packet, which contains a distance function coefficient acquired using first information and second information included in the received first packet, is transferred to the node having the unknown location to be estimated. The unknown location is then estimated using the received distance function coefficient.