A communication network, characterized by comprising: a first level node group and a second level node group, wherein the first level node group comprises a first node and a second node; the second level node group comprises a third node; the nodes in the first level node group and the nodes in the second level node group respectively maintain route information of each node group; the first node comprises the route information of the first level node group and the second level node group; and the second node comprises the route information of the first level node group and second level node group; wherein, the first node and the second node are the nodes with an Id of the same first geographical position information; the third node comprises an Id of second geographical position information; a regional scope displayed by the second geographical position information is larger than a regional scope displayed by the first geographical position information; wherein, the Ids of the first geographical position information are formed by first node Id constructing devices that are associated with the first and second node respectively, and the Id of the second geographical position information are formed by an node Id constructing device that is associated with the third node; each of the first node Id constructing devices and the node Id constructing device comprises: an acquiring unit adapted to acquire geographical position information of a node which each of the first node ID constructing devices and the node ID constructing device associates with; a determining unit adapted to determine a hash space of a node ID by adopting a strip division method according to the geographical position information of the node; and a constructing unit adapted to randomly select one hash value from the hash space, and construct an ID of geographical position information of the node by combining the hash value with other attribute information of the node. a first level node group and a second level node group, wherein the first level node group comprises a first node and a second node; the second level node group comprises a third node; the nodes in the first level node group and the nodes in the second level node group respectively maintain route information of each node group; the first node comprises the route information of the first level node group and the second level node group; and the second node comprises the route information of the first level node group and second level node group; wherein, the first node and the second node are the nodes with an Id of the same first geographical position information; the third node comprises an Id of second geographical position information; a regional scope displayed by the second geographical position information is larger than a regional scope displayed by the first geographical position information; wherein, the Ids of the first geographical position information are formed by first node Id constructing devices that are associated with the first and second node respectively, and the Id of the second geographical position information are formed by an node Id constructing device that is associated with the third node; each of the first node Id constructing devices and the node Id constructing device comprises: an acquiring unit adapted to acquire geographical position information of a node which each of the first node ID constructing devices and the node ID constructing device associates with; a determining unit adapted to determine a hash space of a node ID by adopting a strip division method according to the geographical position information of the node; and a constructing unit adapted to randomly select one hash value from the hash space, and construct an ID of geographical position information of the node by combining the hash value with other attribute information of the node. wherein, the Ids of the first geographical position information are formed by first node Id constructing devices that are associated with the first and second node respectively, and the Id of the second geographical position information are formed by an node Id constructing device that is associated with the third node; each of the first node Id constructing devices and the node Id constructing device comprises: an acquiring unit adapted to acquire geographical position information of a node which each of the first node ID constructing devices and the node ID constructing device associates with; a determining unit adapted to determine a hash space of a node ID by adopting a strip division method according to the geographical position information of the node; and a constructing unit adapted to randomly select one hash value from the hash space, and construct an ID of geographical position information of the node by combining the hash value with other attribute information of the node. an acquiring unit adapted to acquire geographical position information of a node which each of the first node ID constructing devices and the node ID constructing device associates with; a determining unit adapted to determine a hash space of a node ID by adopting a strip division method according to the geographical position information of the node; and a constructing unit adapted to randomly select one hash value from the hash space, and construct an ID of geographical position information of the node by combining the hash value with other attribute information of the node.