Discovery apparatus and method therefor

A discovery apparatus among a plurality of networks including at least one client includes: a transceiver which transmits and receives shared information and a request message to and from the client within the plurality of networks, the shared information being intrinsic information of the clients; a storage unit which receives the shared information from the transceiver and stores the shared information of the transceiver; and a controller which creates a shared space, which stores the shared information in the storage unit, in accordance with the request message received through the transceiver, and manages the shared information stored in the shared space.