To investigate network configuration quickly.SOLUTION: In a network configuration investigation apparatus 10 for investigating configuration of a network to which a plurality of devices are connected, a device investigation unit 22 investigates the type of each device on the network, and a network investigation unit 32 transmits an acquisition command for routing information to an agent operating on a device whose type is a computer, registers the contents of the routing information in a routing information table 320 when the acquisition of the routing information is successful, and generates network configuration information indicating a relationship of the devices on the network, on the basis of the routing information table 320.SELECTED DRAWING: Figure 5
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