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 being implemented by a processor executing instructions stored in a memory and comprising: generating connection relationship information for each of the nodes, on a basis of traffic information including data transmission direction information for the nodes contained in the information transmission network; generating a connectivity map for the nodes on a basis of the connection relationship information for each of the nodes; 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, wherein the connectivity map expresses the connection relationship information in a matrix form to reflect a change in the connection relationship information, and wherein the traffic information map reflects various and variable traffic generation conditions by applying a traffic volume for each node and a ratio of the traffic volume for each node to a maximum traffic volume to the connectivity map.