The Federated Search System was developed to make it possible to reciprocally search by keyword between the Japanese learning gateway (NIME-glad), which stores LOM (Learning Object Metadata) created for Learning Objects on the Internet, and gateways in the USA, Canada, Australia and the EU. This Federated Search System defined the function and method of exchanging LOM between gateways according to the international standard, and using this method, gateways are collaborating with each other. As a result of developing this Federated Search System, it has become possible to search not only Japanese Learning Objects by keyword, but also at the same time to use the Japanese gateway to search through overseas Learning Objects on overseas gateways. Alternatively, the overseas gateways use allows for the possibility of conducting concurrent searches of overseas Learning Objects by keyword as well as Japanese Learning Objects.