A node management gateway device included in a node using a scheme for data-centric object-oriented communication and configured to communicate with other gateway devices (GW2; GW3) connected to a Wide Area Network, WAN, the node management gateway device comprising: a Real-Time Publish-Subscribe, RTPS, processing unit for transmitting and receiving a message with the other gateway devices (GW2; GW3) using an RTPS protocol of the data-centric object-oriented communication scheme and for inserting magic information into a header of the received message in order to transmit the received message to the WAN, the inserted magic information including source IP information of the message, destination IP information of the message, and destination User Datagram Protocol, UDP, information of the message; and a network connection unit for performing an operation of the RTPS processing unit by executing a network connection with each of the other gateway devices (GW2; GW3), wherein, when the node management gateway device is connected to a destination device, the RTPS processing unit is configured to: receive a message having IP information from the destination device; convert the IP information in the received message into actual network IP information to store the converted IP information in a virtual subnet mapping table; add the magic information to the message and transmitting (S730, S740) the message having the actual network IP information to the WAN, receive a reply message from the WAN; convert the actual network IP information into the original IP information based on the virtual subnet mapping table in the received reply message; and deliver the reply message of which the actual network IP information is converted into the original IP information to the destination device, wherein the receiving the reply message from the WAN comprises when inbounding the reply message from the WAN, the RTPS processing unit changing the IP in the magic information included in the reply message into the one transmitted to a destination participant by a source participant and also changing the UDP therein into the one transmitted to the destination participant by the source participant by referring to a virtual subnet mapping table using its own gateway IP as a key. a Real-Time Publish-Subscribe, RTPS, processing unit for transmitting and receiving a message with the other gateway devices (GW2; GW3) using an RTPS protocol of the data-centric object-oriented communication scheme and for inserting magic information into a header of the received message in order to transmit the received message to the WAN, the inserted magic information including source IP information of the message, destination IP information of the message, and destination User Datagram Protocol, UDP, information of the message; and a network connection unit for performing an operation of the RTPS processing unit by executing a network connection with each of the other gateway devices (GW2; GW3), wherein, when the node management gateway device is connected to a destination device, the RTPS processing unit is configured to: receive a message having IP information from the destination device; convert the IP information in the received message into actual network IP information to store the converted IP information in a virtual subnet mapping table; add the magic information to the message and transmitting (S730, S740) the message having the actual network IP information to the WAN, receive a reply message from the WAN; convert the actual network IP information into the original IP information based on the virtual subnet mapping table in the received reply message; and deliver the reply message of which the actual network IP information is converted into the original IP information to the destination device, wherein the receiving the reply message from the WAN comprises when inbounding the reply message from the WAN, the RTPS processing unit changing the IP in the magic information included in the reply message into the one transmitted to a destination participant by a source participant and also changing the UDP therein into the one transmitted to the destination participant by the source participant by referring to a virtual subnet mapping table using its own gateway IP as a key. receive a message having IP information from the destination device; convert the IP information in the received message into actual network IP information to store the converted IP information in a virtual subnet mapping table; add the magic information to the message and transmitting (S730, S740) the message having the actual network IP information to the WAN, receive a reply message from the WAN; convert the actual network IP information into the original IP information based on the virtual subnet mapping table in the received reply message; and deliver the reply message of which the actual network IP information is converted into the original IP information to the destination device, wherein the receiving the reply message from the WAN comprises when inbounding the reply message from the WAN, the RTPS processing unit changing the IP in the magic information included in the reply message into the one transmitted to a destination participant by a source participant and also changing the UDP therein into the one transmitted to the destination participant by the source participant by referring to a virtual subnet mapping table using its own gateway IP as a key.