A network management device, comprising: a storing unit configured to store network configuration data and a controlling unit, wherein the network configuration data stored by the storing unit includes: a device position information table configured to, for each combination of a communication device constituting a network and a layer to which the communication device belongs, store an entry formed by a group including a device identifier as identification information of the communication device, display coordinate values (26. 27) of an icon of the communication device in the layer, and a layer value representing the layer to which the communication device belongs; and a section position information table configured to, for each section as a logical connection in a same layer between the communication devices, store an entry formed by a group including a section identifier as identification information of the section, display coordinate values (215, 216, 217, 218) of both end points of a line segment representing the section, and a layer value representing the layer to which the section belongs, and wherein the controlling unit is configured to extract the entry including a specific layer value from each of the device position information table and the section position information table of the network configuration data, and display a network configuration diagram in accordance with the display coordinate values (26, 27) of the icon in the entry extracted from the device position information table and the display coordinate values (215, 216, 217, 218) of both the end points of the line segment in the entry extracted from the section position information table. a storing unit configured to store network configuration data and a controlling unit, wherein the network configuration data stored by the storing unit includes: a device position information table configured to, for each combination of a communication device constituting a network and a layer to which the communication device belongs, store an entry formed by a group including a device identifier as identification information of the communication device, display coordinate values (26. 27) of an icon of the communication device in the layer, and a layer value representing the layer to which the communication device belongs; and a section position information table configured to, for each section as a logical connection in a same layer between the communication devices, store an entry formed by a group including a section identifier as identification information of the section, display coordinate values (215, 216, 217, 218) of both end points of a line segment representing the section, and a layer value representing the layer to which the section belongs, and a device position information table configured to, for each combination of a communication device constituting a network and a layer to which the communication device belongs, store an entry formed by a group including a device identifier as identification information of the communication device, display coordinate values (26. 27) of an icon of the communication device in the layer, and a layer value representing the layer to which the communication device belongs; and a section position information table configured to, for each section as a logical connection in a same layer between the communication devices, store an entry formed by a group including a section identifier as identification information of the section, display coordinate values (215, 216, 217, 218) of both end points of a line segment representing the section, and a layer value representing the layer to which the section belongs, and wherein the controlling unit is configured to extract the entry including a specific layer value from each of the device position information table and the section position information table of the network configuration data, and display a network configuration diagram in accordance with the display coordinate values (26, 27) of the icon in the entry extracted from the device position information table and the display coordinate values (215, 216, 217, 218) of both the end points of the line segment in the entry extracted from the section position information table.