1. A method for configuring a data transmission path from a first node to a second node at a predetermined node in an ad hoc network, the method comprising: calculating a number of optimal cooperative nodes, M opt , in the network; transmitting a cooperative node request message including the number of the optimal cooperative nodes, M opt , to all nodes in the network; receiving a cooperative node reply message from one or more nodes in the network; configuring an optimal transmission path from the first node to the second node and cooperative transmission nodes and cooperative reception nodes in each hop of the optimal transmission path, based on the cooperative node reply message; and transmitting a cooperative node setup message indicating information on the cooperative transmission nodes and the cooperative reception nodes for optimal transmission path configuration to associated nodes.