The invention discloses methods and apparatuses for domain discovery, management and administration. More particularly, this research discloses a domain discovering method and apparatus, and a domain management and administration method and apparatus for supporting mergence and split of domains. The method for discovering a domain management device includes: transmitting a discovery request message to a domain management device through a network; receiving a discovery response message to the discovery request message from the domain management device; and deciding a domain management device to be communicated with based on the discovery response message.