Method and apparatus for providing conference service and method and apparatus for providing of sound data for conference service

A method and an apparatus for providing a conference service, a method and an apparatus for providing sound data for a conference service are provided to give right for conference establishment and control to a common SIP(Session Initiation Protocol) terminal and to confirm a conference property through the fundamental SIP signal message. A method for providing a conference service includes the steps of: issuing an ID for a conference by receiving ID issue application for the conference from a conference establisher(100); designating a subscriber attending the conference having the ID issued from the conference establisher(110); requesting the designated attendant to attend the conference when the conference establisher requests the designated attendant to attend the conference; generating an interactive sound channel with a response to the request(120); combining sound data received from an attendant who responds to the attendance of the conference according to a inputted time of the sound data; and transmitting combined sound data of which a sound data corresponding to each attendant is removed(130).