The invention discloses a calling managerial system applied in an IMS terminal. The calling managerial system comprises a calling managerial module, an upper layer applied module and a network module;wherein, the calling managerial module is used for integrating the dialogue controlling logic shared by the upper layer applied businesses, so that the managerial information of dialogue control is offered to the calling dialogue process of the upper layer applied module and the network module. The upper layer applied module is used for sending or receiving requests on calling dialogues and for providing managerial information of dialogue control so as to execute the upper layer applied businesses according to the calling dialogue managerial module. The network module is used for receiving and sending out the requests and responses generated by the executed upper layer applied businesses. Correspondingly, the invention also provides the calling managerial method of the IMS terminal and the IMS terminal. The invention reduces the code redundancy of the dialogue control logic for the applied businesses in the IMA terminal, realizes the centralized maintenance of the dialogue control logic and also reflects the principle on the reuse and delamination of a functional module.