A node information storage unit stores an entry in which an address and a record type are associated with a host name. An address translating unit translates an address of a record type different from a record type received from a terminal device in the entry into an address of the received record type based on a predetermined rule. An entry searching unit searches the node information storage unit, and specifies an entry corresponding to a host name received from the terminal device. A search result transmitting unit transmits an address included in the specified entry to the terminal device.