A terminal protocol function update method, comprising: receiving, by a terminal, protocol function configuration information of a first service configured by a network side device; and updating, by the terminal, a protocol function according to the protocol function configuration information; characterized in that the protocol function configuration information is one of the following: a complete protocol function file; a partial protocol function file; and an incremental protocol function file based on a historically downloaded protocol function; wherein the complete protocol function file comprises: a protocol function description and a protocol function file, and the protocol function description comprises at least one of the following: a protocol function indication, a protocol interface indication, an updated protocol function file length indication, and a protocol function identifier; or, wherein the partial protocol function file comprises: a protocol function description and a protocol function file, and the protocol function description comprises at least one of the following: a reference template or a reference function of the protocol function, a protocol function indication, a protocol interface indication, an updated protocol function file length indication, and a protocol function identifier; or, wherein the incremental protocol function file based on a historically downloaded protocol function comprises: a protocol function description and a protocol function file, and the protocol function description comprises at least one of the following: a reference template or a reference function of the protocol function, insertion position information of the incremental protocol function, an updated protocol function file length indication, and a protocol function identifier. receiving, by a terminal, protocol function configuration information of a first service configured by a network side device; and updating, by the terminal, a protocol function according to the protocol function configuration information; characterized in that the protocol function configuration information is one of the following: a complete protocol function file; a partial protocol function file; and an incremental protocol function file based on a historically downloaded protocol function; wherein the complete protocol function file comprises: a protocol function description and a protocol function file, and the protocol function description comprises at least one of the following: a protocol function indication, a protocol interface indication, an updated protocol function file length indication, and a protocol function identifier; or, wherein the partial protocol function file comprises: a protocol function description and a protocol function file, and the protocol function description comprises at least one of the following: a reference template or a reference function of the protocol function, a protocol function indication, a protocol interface indication, an updated protocol function file length indication, and a protocol function identifier; or, wherein the incremental protocol function file based on a historically downloaded protocol function comprises: a protocol function description and a protocol function file, and the protocol function description comprises at least one of the following: a reference template or a reference function of the protocol function, insertion position information of the incremental protocol function, an updated protocol function file length indication, and a protocol function identifier. a complete protocol function file; a partial protocol function file; and an incremental protocol function file based on a historically downloaded protocol function; wherein the complete protocol function file comprises: a protocol function description and a protocol function file, and the protocol function description comprises at least one of the following: a protocol function indication, a protocol interface indication, an updated protocol function file length indication, and a protocol function identifier; or, wherein the partial protocol function file comprises: a protocol function description and a protocol function file, and the protocol function description comprises at least one of the following: a reference template or a reference function of the protocol function, a protocol function indication, a protocol interface indication, an updated protocol function file length indication, and a protocol function identifier; or, wherein the incremental protocol function file based on a historically downloaded protocol function comprises: a protocol function description and a protocol function file, and the protocol function description comprises at least one of the following: a reference template or a reference function of the protocol function, insertion position information of the incremental protocol function, an updated protocol function file length indication, and a protocol function identifier.