The present invention discloses a system and method for switching click to dial (CTD) service to multimedia conference service. The method comprises: a CTD service is performed between one user equipment (UE) and another; an application serve invites at least one of the UEs and makes said at least one of the UEs take media negotiation with the media server so as to carry out the multimedia conference service, wherein the application server is in charge of realizing not only the CTD service but also the multimedia conference service. The application server invites at least one of the UEs and makes said at least one of the UEs take media negotiation with the media server so as to carry out the multimedia conference service, thus the limitation that extra UEs cannot be joined in the call in the CTD service is overcome.