An Access Control, AC, method, performed by a terminal device, comprising: transmitting (S301) an AC parameter request to a network-side device, the network side-device comprising a Radio Access Network, RAN, device or a Core Network, CN, device; receiving (S302) a first AC parameter returned by the network-side device in response to the AC parameter request, wherein the first AC parameter has a correspondence with a network slice; and performing (S303) AC for the network slice corresponding to the first AC parameter based on the first AC parameter; characterized in that , the method further comprises: receiving a System Information Block, SIB, from the Radio Access Network, RAN, device in a broadcast manner carrying a second AC parameter, wherein the second AC parameter does not have a correspondence with the network slice; wherein, receiving the first AC parameter returned by the network-side device in response to the AC parameter request comprises: receiving NAS signaling or RRC signaling carrying acquisition indication information, wherein the acquisition indication information comprises a differential parameter of the first AC parameter and the second AC parameter and comprises differential indication information; and generating the first AC parameter based on the differential parameter and the second AC parameter according to the differential indication information. transmitting (S301) an AC parameter request to a network-side device, the network side-device comprising a Radio Access Network, RAN, device or a Core Network, CN, device; receiving (S302) a first AC parameter returned by the network-side device in response to the AC parameter request, wherein the first AC parameter has a correspondence with a network slice; and performing (S303) AC for the network slice corresponding to the first AC parameter based on the first AC parameter; characterized in that , the method further comprises: receiving a System Information Block, SIB, from the Radio Access Network, RAN, device in a broadcast manner carrying a second AC parameter, wherein the second AC parameter does not have a correspondence with the network slice; wherein, receiving the first AC parameter returned by the network-side device in response to the AC parameter request comprises: receiving NAS signaling or RRC signaling carrying acquisition indication information, wherein the acquisition indication information comprises a differential parameter of the first AC parameter and the second AC parameter and comprises differential indication information; and generating the first AC parameter based on the differential parameter and the second AC parameter according to the differential indication information. receiving a System Information Block, SIB, from the Radio Access Network, RAN, device in a broadcast manner carrying a second AC parameter, wherein the second AC parameter does not have a correspondence with the network slice; wherein, receiving the first AC parameter returned by the network-side device in response to the AC parameter request comprises: receiving NAS signaling or RRC signaling carrying acquisition indication information, wherein the acquisition indication information comprises a differential parameter of the first AC parameter and the second AC parameter and comprises differential indication information; and generating the first AC parameter based on the differential parameter and the second AC parameter according to the differential indication information. receiving NAS signaling or RRC signaling carrying acquisition indication information, wherein the acquisition indication information comprises a differential parameter of the first AC parameter and the second AC parameter and comprises differential indication information; and generating the first AC parameter based on the differential parameter and the second AC parameter according to the differential indication information. <EOS>