Patent ID: 8520685

Claim:
A signal relay apparatus that is connected to a first network with a signal branching apparatus that branches a signal transmitted via the first network to a second network, the signal relay apparatus adding a signal, which is transmitted from a node apparatus via a third network, to the first network, the signal relay apparatus comprising: a memory; and a processor coupled to the memory, wherein the processor executes a process comprising: generating link information including an identifier for identifying a local apparatus, an identifier for identifying a link of the local apparatus, an identifier for identifying a remote apparatus, an identifier for identifying a link of the remote apparatus that is capable of branching the link of the local apparatus, and a pair of connectable links, the link information including connectable-link information that indicates the pair of connectable links, the connectable-link information associating a first link with a second link, the first link connecting to the node apparatus for transmitting a signal via the second network connected to the local apparatus, the second link connecting to other device that is capable of branching a signal transmitted via the first link of the local apparatus via the third network when the signal is transmitted via the first network are virtually connected each other; storing the connectable-link information including the pair of connectable links in which the first link that is used by the node apparatus for transmitting a signal and the second link of the signal branching apparatus that is capable of branching a signal transmitted via the first link with the same wavelength of the signal transmitted via the first link; and transmitting the connectable-link information stored at the storing.