In a network design processing device 1, a network diagram creation processing section 10 creates/edits a real device network diagram constituted by real devices which physically exist, from input with the use of a computer screen; expresses one or multiple real devices having the same purpose or function as a virtual device to create/edit a virtual device network diagram constituted by virtual devices; and stores configuration data of the real device network diagram, configuration data of the virtual device network diagram, and information about the relationship between the configuration data into a network configuration data storage section 15. A network configuration data output processing section 16 switches among the real device network diagram, the virtual device network diagram and a network diagram in which the network diagrams are overlapped with each other, in response to specification from the outside, and displays the network diagram.
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