A wireless local area network discovery and selection method performed by a wireless local area network discovery and selection device, the method comprising: • receiving a registration request sent by a terminal, wherein the registration request indicates that the terminal initiates packet switched data to a cellular network (step 200); • determining whether a wireless local area network needs to be used to offload the packet switched data in the cellular network, wherein the determining whether the wireless local area network needs to be used to offload the packet switched data in the cellular network comprises: ∘ acquiring, from a home location register, a priority of a user of the terminal; ∘ determining whether the priority of the user corresponding to the terminal is higher than or equal to a preset priority threshold; ∘ determining, when the priority of the user corresponding to the terminal is higher than or equal to the preset priority threshold, that the wireless local area network does not need to be used to offload the packet switched data in the cellular network; ∘ determining, when the priority of the user corresponding to the terminal is lower than the preset priority threshold, that the wireless local area network needs to be used to offload the packet switched data in the cellular network; • acquiring access parameter information when the wireless local area network needs to be used to offload the packet switched data in the cellular network, wherein the access parameter information comprises an offload policy message (step 201); • sending a notification message carrying the access parameter information to the terminal (step 202). • receiving a registration request sent by a terminal, wherein the registration request indicates that the terminal initiates packet switched data to a cellular network (step 200); • determining whether a wireless local area network needs to be used to offload the packet switched data in the cellular network, wherein the determining whether the wireless local area network needs to be used to offload the packet switched data in the cellular network comprises: ∘ acquiring, from a home location register, a priority of a user of the terminal; ∘ determining whether the priority of the user corresponding to the terminal is higher than or equal to a preset priority threshold; ∘ determining, when the priority of the user corresponding to the terminal is higher than or equal to the preset priority threshold, that the wireless local area network does not need to be used to offload the packet switched data in the cellular network; ∘ determining, when the priority of the user corresponding to the terminal is lower than the preset priority threshold, that the wireless local area network needs to be used to offload the packet switched data in the cellular network; ∘ acquiring, from a home location register, a priority of a user of the terminal; ∘ determining whether the priority of the user corresponding to the terminal is higher than or equal to a preset priority threshold; ∘ determining, when the priority of the user corresponding to the terminal is higher than or equal to the preset priority threshold, that the wireless local area network does not need to be used to offload the packet switched data in the cellular network; ∘ determining, when the priority of the user corresponding to the terminal is lower than the preset priority threshold, that the wireless local area network needs to be used to offload the packet switched data in the cellular network; • acquiring access parameter information when the wireless local area network needs to be used to offload the packet switched data in the cellular network, wherein the access parameter information comprises an offload policy message (step 201); • sending a notification message carrying the access parameter information to the terminal (step 202).