A network access method, comprising: receiving, by an access management network element, information about an area accessed by a terminal device; obtaining, by the access management network element, information about an area allowed to be accessed by the terminal device, wherein the area allowed to be accessed by the terminal device is controlled by the access management network element within a preset range based on a requirement of a service; and determining, by the access management network element based on the information about the area accessed by the terminal device and the information about the area allowed to be accessed by the terminal device, whether to allow access of the terminal device; wherein the obtaining, by the access management network element, information about an area allowed to be accessed by the terminal device comprises: sending, by the access management network element, a request message to an information providing network element, wherein the request message is used to request the information about the area allowed to be accessed by the terminal device, and the information providing network element comprises: a unified device management network element, a policy control network element, or an authentication service network element; wherein the information providing network element provides geographic location information for the access management network element; and wherein the geographic location information is mapped as a corresponding cell information by the access management network element. receiving, by an access management network element, information about an area accessed by a terminal device; obtaining, by the access management network element, information about an area allowed to be accessed by the terminal device, wherein the area allowed to be accessed by the terminal device is controlled by the access management network element within a preset range based on a requirement of a service; and determining, by the access management network element based on the information about the area accessed by the terminal device and the information about the area allowed to be accessed by the terminal device, whether to allow access of the terminal device; wherein the obtaining, by the access management network element, information about an area allowed to be accessed by the terminal device comprises: sending, by the access management network element, a request message to an information providing network element, wherein the request message is used to request the information about the area allowed to be accessed by the terminal device, and the information providing network element comprises: a unified device management network element, a policy control network element, or an authentication service network element; wherein the information providing network element provides geographic location information for the access management network element; and wherein the geographic location information is mapped as a corresponding cell information by the access management network element. sending, by the access management network element, a request message to an information providing network element, wherein the request message is used to request the information about the area allowed to be accessed by the terminal device, and the information providing network element comprises: a unified device management network element, a policy control network element, or an authentication service network element; wherein the information providing network element provides geographic location information for the access management network element; and wherein the geographic location information is mapped as a corresponding cell information by the access management network element.