An ID space conversion system which consistently provides setting information to both a gateway and a data processing unit, to which a plurality of devices each including components are connected via the gateway and a network and a plurality of applications are connected, the data processing unit being configured to mediate data between the plurality of devices and the plurality of applications, the system comprising: an ID space conversion function unit that generates a non-overlapping unique system ID for each type of the components on the basis of a physical ID of a component included in the device; a sharing function unit that creates a gateway-setting file including a correspondence relationship between the physical ID of the component included in the device and the system ID generated by the ID space conversion function unit and verified specific device configuration information, and shares the gateway file with the gateway; and a device configuration verification function unit that determines whether the specific device configuration information, including component information representing the types of the plurality of components on the device given to the ID space conversion system and information that uniquely identifies the component within the device, and relation information indicating the connection relationship between the plurality of components indicated by the component information, conforms to device design definition information that is defined for each of the plurality of devices and is correct information for the specific device configuration information, and consisting of component definition information indicating the definition of the type of each component and relation information indicating the connection relationship between the components corresponding to the types indicated in the component definition information, wherein the ID space conversion function unit is configured to generate the system ID for the device indicated in the specific device configuration information determined to conform to the device design definition information by the device configuration verification function unit, and the sharing function unit is configured to share, with the gateway the specific device configuration information determined to conform to the device design definition information, and wherein the data processing unit determines whether data of the component of the device sent from the device via the gateway includes the generated system ID, and the gateway adds, based on the created gateway-setting file, to the data of the component obtained from the device, the generated system ID corresponding to the physical ID of the component included in the device to output system ID-added data to the network. an ID space conversion function unit that generates a non-overlapping unique system ID for each type of the components on the basis of a physical ID of a component included in the device; a sharing function unit that creates a gateway-setting file including a correspondence relationship between the physical ID of the component included in the device and the system ID generated by the ID space conversion function unit and verified specific device configuration information, and shares the gateway file with the gateway; and a device configuration verification function unit that determines whether the specific device configuration information, including component information representing the types of the plurality of components on the device given to the ID space conversion system and information that uniquely identifies the component within the device, and relation information indicating the connection relationship between the plurality of components indicated by the component information, conforms to device design definition information that is defined for each of the plurality of devices and is correct information for the specific device configuration information, and consisting of component definition information indicating the definition of the type of each component and relation information indicating the connection relationship between the components corresponding to the types indicated in the component definition information, wherein the ID space conversion function unit is configured to generate the system ID for the device indicated in the specific device configuration information determined to conform to the device design definition information by the device configuration verification function unit, and the sharing function unit is configured to share, with the gateway the specific device configuration information determined to conform to the device design definition information, and wherein the data processing unit determines whether data of the component of the device sent from the device via the gateway includes the generated system ID, and the gateway adds, based on the created gateway-setting file, to the data of the component obtained from the device, the generated system ID corresponding to the physical ID of the component included in the device to output system ID-added data to the network.