A shared-label extracting unit extracts a shared label to be associated with a device corresponding to a memory shared by a plurality of control devices. A shared-label write/read information generating unit identifies a control device writing data and a control device reading data with respect to the shared label by referring to a control program, and generates shared-label write/read information. A device batch assigning/associating unit sorts shared labels using the shared-label write/read information, and associates the shared label with an address of the device for each sort based on a result of determining a configuration of the control system.