1. A method for modeling an information transmission network having a hierarchical structure in which information transmission is conducted between pairs of nodes to which pre-defined relationships are assigned the method comprising: generating connection relationship information for each node, on a basis of traffic information including data transmission direction information for nodes contained in the information transmission network; generating a connectivity map for the nodes on a basis of the connection relationship information for each node; and generating a traffic information map accounting for traffic intensities between pairs of the nodes by applying inter-node traffic information to the connectivity map.