Disclosed herein are an apparatus and method for identifying interoperability between object-identifier-based heterogeneous identifier nodes for a next generation network. The apparatus includes a plurality of identifier registry servers located in a plurality of unit networks connected to an open network, and configured to receive and store identifiers and locators of nodes of corresponding unit networks, and also configured to, as identifiers of destination nodes that are communication target nodes are input from nodes of the unit networks, return locators of the destination nodes, wherein unique object identifiers are assigned to the identifier registry servers. An object identifier resolution server is located in the open network, and is configured to receive and store object identifiers and locators of the identifier registry servers, and is also configured to, as object identifiers are input from nodes of the unit networks, transfer locators of identifier registry servers to the nodes.