A device configuration management apparatus comprising: a logical node information storage storing logical node information about a logical node associated with a particular device and a particular location, the logical node information including for each of logical nodes a device ID for identifying the particular device and location information which is information for identifying the location; a network information storage storing network information as a set of information about an edge connecting two logical nodes, wherein the edge is a link between two logical nodes; and a node update processor configured to perform processing for updating at least one of the device ID and the location information with regard to the particular logical node in the logical node information stored in the logical node information storage, characterized in that the logical node information further includes, for each of the logical nodes, a logical node ID for identifying the logical node, the network information further includes a first logical node ID for identifying a start point node which is a start point of the edge and a second logical node ID for identifying an end point node which is an end point of the edge, and the device configuration management apparatus further comprises: a history storage storing a history about the logical node information stored in the logical node information storage; a device ID history acquirer configured to acquire a first device ID associated with a first logical node ID in the logical node information storage and a second device ID associated with the first logical node ID in the history storage, so that even if the first device is replaced with the second device, the device IDs of the first and the second devices can be acquired using the first logical node ID, and a measurement value history acquirer configured to acquire a first measurement value measured by the first device identified by the first device ID and a second measurement value measured by the second device identified by the second device ID, and to combine the first measurement value and the second measurement value in a time axis direction, so that continuous measurement data are acquired with the first logical node ID. a logical node information storage storing logical node information about a logical node associated with a particular device and a particular location, the logical node information including for each of logical nodes a device ID for identifying the particular device and location information which is information for identifying the location; a network information storage storing network information as a set of information about an edge connecting two logical nodes, wherein the edge is a link between two logical nodes; and a node update processor configured to perform processing for updating at least one of the device ID and the location information with regard to the particular logical node in the logical node information stored in the logical node information storage, characterized in that the logical node information further includes, for each of the logical nodes, a logical node ID for identifying the logical node, the network information further includes a first logical node ID for identifying a start point node which is a start point of the edge and a second logical node ID for identifying an end point node which is an end point of the edge, and the device configuration management apparatus further comprises: a history storage storing a history about the logical node information stored in the logical node information storage; a device ID history acquirer configured to acquire a first device ID associated with a first logical node ID in the logical node information storage and a second device ID associated with the first logical node ID in the history storage, so that even if the first device is replaced with the second device, the device IDs of the first and the second devices can be acquired using the first logical node ID, and a measurement value history acquirer configured to acquire a first measurement value measured by the first device identified by the first device ID and a second measurement value measured by the second device identified by the second device ID, and to combine the first measurement value and the second measurement value in a time axis direction, so that continuous measurement data are acquired with the first logical node ID. a history storage storing a history about the logical node information stored in the logical node information storage; a device ID history acquirer configured to acquire a first device ID associated with a first logical node ID in the logical node information storage and a second device ID associated with the first logical node ID in the history storage, so that even if the first device is replaced with the second device, the device IDs of the first and the second devices can be acquired using the first logical node ID, and a measurement value history acquirer configured to acquire a first measurement value measured by the first device identified by the first device ID and a second measurement value measured by the second device identified by the second device ID, and to combine the first measurement value and the second measurement value in a time axis direction, so that continuous measurement data are acquired with the first logical node ID.