The invention provides a network side function extension method and a network side server. The method comprises the following steps: acquiring identification information of an access terminal; searching whether an execution operation associated with the access terminal is existent according to the identification information in a preset strategy information stable, wherein the strategy information table comprises the identification information and a function operation associated with the identification information; the function operation comprises the initial function operation information and the extensible function operation information; controlling the access terminal to execute the corresponding operation according to a searching result and by use of the home gateway. By use of the network side function extension method and the network side server provided by the invention, the extension of the function service can be realized without adding any new service plugins for the home gateway, the fast deployment of the network architecture is facilitated, and the user cost is lowered, thereby effectively improving the practicability of the extension method.