A cyber security management system, wherein the management system is configured to implement security management of a network comprising at least two network slices, and the system comprises user equipment, UE, an access network AN, a network function selection module, and at least two authentication modules, wherein the UE is configured to send a first service request to the network function selection module, wherein the first service request carries authentication protocol information; the network function selection module is configured to: select a target authentication module from the at least two authentication modules based on the authentication protocol information, and send a second service request to the target authentication module; the target authentication module is configured to: receive the second service request, and perform mutual authentication with the UE; the target authentication module is further configured to: determine a first security configuration according to a specified security policy of a specified network slice to which the UE is to be attached, and send a second service request response to the AN, wherein the second service request response carries the first security configuration; and the AN is configured to: determine a second security configuration based on the first security configuration or the specified security policy, and send a first service request response to the UE, wherein the first service request response carries the second security configuration, wherein the authentication protocol information comprises identifiers of at least two second authentication protocols supported by the UE; and the network function selection module is specifically configured to: determine, based on an authentication protocol selection priority that is set in the network, an authentication protocol with a highest selection priority from the second authentication protocols supported by the UE, and select a to-be-selected authentication module that supports the authentication protocol with the highest selection priority from the at least two authentication modules as the target authentication module. the UE is configured to send a first service request to the network function selection module, wherein the first service request carries authentication protocol information; the network function selection module is configured to: select a target authentication module from the at least two authentication modules based on the authentication protocol information, and send a second service request to the target authentication module; the target authentication module is configured to: receive the second service request, and perform mutual authentication with the UE; the target authentication module is further configured to: determine a first security configuration according to a specified security policy of a specified network slice to which the UE is to be attached, and send a second service request response to the AN, wherein the second service request response carries the first security configuration; and the AN is configured to: determine a second security configuration based on the first security configuration or the specified security policy, and send a first service request response to the UE, wherein the first service request response carries the second security configuration, wherein the authentication protocol information comprises identifiers of at least two second authentication protocols supported by the UE; and the network function selection module is specifically configured to: determine, based on an authentication protocol selection priority that is set in the network, an authentication protocol with a highest selection priority from the second authentication protocols supported by the UE, and select a to-be-selected authentication module that supports the authentication protocol with the highest selection priority from the at least two authentication modules as the target authentication module.