A method for accessing a conference applied to an implementation environment having an apparatus for accessing a conference, a terminal and multiple conference systems, comprising: receiving, by the apparatus for accessing a conference, a call request sent by the terminal, wherein the call request carries media information of the terminal and a unified access number that corresponds to the apparatus for accessing a conference; and sending a call response to the terminal so as to establish a first session with the terminal, wherein the call response carries media information of the apparatus for accessing a conference; sending, by using the first session, information used to prompt for entering a conference passcode, and receiving a conference passcode sent by the terminal, characterized by querying a conference access number that corresponds to the conference passcode sent by the terminal from at least two conference access numbers, wherein each conference access number corresponds to one of the multiple conference systems; wherein the querying specifically comprises: analyzing a format feature of the conference passcode sent by the terminal, and querying, according to correspondence between format features and conference access numbers, a conference access number that corresponds to the format feature of the conference passcode sent by the terminal from the at least two conference access numbers; and instructing, according to the queried conference access number and the conference passcode sent by the terminal, the terminal to establish a second session with a conference system that corresponds to the queried conference access number, so that the terminal joins a conference by using the second session. receiving, by the apparatus for accessing a conference, a call request sent by the terminal, wherein the call request carries media information of the terminal and a unified access number that corresponds to the apparatus for accessing a conference; and sending a call response to the terminal so as to establish a first session with the terminal, wherein the call response carries media information of the apparatus for accessing a conference; sending, by using the first session, information used to prompt for entering a conference passcode, and receiving a conference passcode sent by the terminal, characterized by querying a conference access number that corresponds to the conference passcode sent by the terminal from at least two conference access numbers, wherein each conference access number corresponds to one of the multiple conference systems; wherein the querying specifically comprises: analyzing a format feature of the conference passcode sent by the terminal, and querying, according to correspondence between format features and conference access numbers, a conference access number that corresponds to the format feature of the conference passcode sent by the terminal from the at least two conference access numbers; and instructing, according to the queried conference access number and the conference passcode sent by the terminal, the terminal to establish a second session with a conference system that corresponds to the queried conference access number, so that the terminal joins a conference by using the second session.