A method for a telecom network to provide a session service to an internet, wherein the method comprises: upgrading an access-side device of the telecom network to support an internet application protocol, wherein the telecom network is connected with the internet via the access-side device, the telecom network is Internet Protocol Multimedia Subsystem, IMS, and comprises a Session Border Controller, SBC, a Proxy Call Session Control Function entity, P-CSCF, and a Serving Call Session Control Function entity, S-CSCF, the access-side device is the SBC, and the internet application protocol is Hypertext Markup Language 5, HTML5, protocol; establishing, by an internet user, a session with a telecom user or another internet user through the telecom network; wherein the establishing, by an internet user, a session with a telecom user or another internet user through the telecom network comprises: initiating, by the internet user, a session request, and/or, receiving, by the internet user, a session request; wherein the initiating, by the internet user, a session request comprises: initiating, by the internet user, a session request to the SBC under HTML5 protocol; forwarding, by the SBC, the session request to the P-CSCF under the HTML5 protocol; encapsulating, by the P-CSCF, the session request as a SIP message, and forwarding the SIP message to the S-CSCF; calling, by the S-CSCF, the telecom user or said another internet user, and returning a call success message; wherein the receiving, by the internet user, a session request comprises: after receiving a call request directed to the internet user, forwarding, by the S-CSCF, the call request to the P-CSCF corresponding to the internet user; converting, by the P-CSCF, the call request in the format of INVITE into a call message of the HTML5 protocol and forwarding said call message to the SBC; transparently transmitting, by the SBC, the call message of the HTML5 protocol to the internet user; and responsive to the call message, the internet user establishes a session with the telecom user or said another internet user who initiates the call request. upgrading an access-side device of the telecom network to support an internet application protocol, wherein the telecom network is connected with the internet via the access-side device, the telecom network is Internet Protocol Multimedia Subsystem, IMS, and comprises a Session Border Controller, SBC, a Proxy Call Session Control Function entity, P-CSCF, and a Serving Call Session Control Function entity, S-CSCF, the access-side device is the SBC, and the internet application protocol is Hypertext Markup Language 5, HTML5, protocol; establishing, by an internet user, a session with a telecom user or another internet user through the telecom network; wherein the establishing, by an internet user, a session with a telecom user or another internet user through the telecom network comprises: initiating, by the internet user, a session request, and/or, receiving, by the internet user, a session request; wherein the initiating, by the internet user, a session request comprises: initiating, by the internet user, a session request to the SBC under HTML5 protocol; forwarding, by the SBC, the session request to the P-CSCF under the HTML5 protocol; encapsulating, by the P-CSCF, the session request as a SIP message, and forwarding the SIP message to the S-CSCF; calling, by the S-CSCF, the telecom user or said another internet user, and returning a call success message; wherein the receiving, by the internet user, a session request comprises: after receiving a call request directed to the internet user, forwarding, by the S-CSCF, the call request to the P-CSCF corresponding to the internet user; converting, by the P-CSCF, the call request in the format of INVITE into a call message of the HTML5 protocol and forwarding said call message to the SBC; transparently transmitting, by the SBC, the call message of the HTML5 protocol to the internet user; and responsive to the call message, the internet user establishes a session with the telecom user or said another internet user who initiates the call request.