The present invention relates to a method and apparatus for controlling a multimedia conference by an application server, the method includes: in the multimedia conference, the application server divides the m-line in a received terminal session description protocol (SDP), message into two SDPs according to the type of media, and sends them respectively to an audio-video media server and a data media server, or assembles SDPs returned by the audio-video media server and the data media server into one SDP, and sends it to a terminal. The apparatus includes an application server, and the application server includes an SDP dividing module and an SDP assembling module. This invention simplifies the process of signaling interaction, reduces the consumption of the signaling interaction; better synchronizes the controlling of the conventional audio-video media and the data media, makes the realization of the multimedia client more simple; meanwhile, is compatible with the terminals traditionally not supporting data media.