The invention discloses a network access method and device. The method mainly comprises the following steps: a corresponding relationship between an available network and a preset network access point is established through the network state information of the position at which a detected terminal is located, wherein the network access point serves as a shared port of data transmission between an application program in the terminal and the Internet; and when the condition that the application protocol supported by the application program and the application protocol supported by the available network are different is determined, the application protocol of the data processing request message sent by the application program is converted into the application protocol supported by the available network, that is, the networking service is performed on all application programs in the terminal through a common network access point, so the terminal resource waste problem caused by the reason that network selection is performed by each application program independently can be avoided.