A method for forming a dynamic bridge node of a wireless mesh network is provided. The method includes enabling a bridge mode of at least one of the mesh nodes in correspondence to a mutual coverage, when a signal corresponding to a connection source is received from the external network, transmitting, by the mesh node having the enabled bridge mode, rank information for connection to the external network with reference to a distance to the connection source and the mesh node's own traffic, comparing rank information received from a neighboring mesh node having an enabled bridge mode with the mesh node's own rank information, and generating an order of priority for connection to the external network. The mesh node with the highest order of priority operates as a bridge node for connection of the external network and the wireless mesh network.