A method for controlling a terminal to use a wireless network, comprising: obtaining, by a network decision device, a terminal identifier of the terminal and service information, wherein the service information is information related to a service performed by the terminal; determining, by the network decision device, based on the service information, an available wireless network set available to the terminal, wherein the available wireless network set comprises one or more wireless networks; and determining, by the network decision device, a network trigger device based on an attach status of the terminal, and sending, by the network decision device, indication information to the network trigger device, to indicate the network trigger device to trigger the terminal to use a wireless network in the available wireless network set, wherein the indication information comprises the terminal identifier and all or a part of the available wireless network set, wherein the determining, by the network decision device, the network trigger device based on an attach status of the terminal, and sending the indication information to the determined network trigger device comprises: determining, by the network decision device, a target wireless network from the available wireless network set; determining, by the network decision device, the network trigger device based on the attach status of the terminal and the target wireless network; and sending, by the network decision device, the indication information to the determined network trigger device, wherein the indication information comprises the terminal identifier and the target wireless network, and wherein the network decision device is a policy control device obtaining the terminal identifier and the service information from an application function device or a packet detection device, the policy control device being a policy control function, PCF, device or a policy and charging rules function, PCRF, device. obtaining, by a network decision device, a terminal identifier of the terminal and service information, wherein the service information is information related to a service performed by the terminal; determining, by the network decision device, based on the service information, an available wireless network set available to the terminal, wherein the available wireless network set comprises one or more wireless networks; and determining, by the network decision device, a network trigger device based on an attach status of the terminal, and sending, by the network decision device, indication information to the network trigger device, to indicate the network trigger device to trigger the terminal to use a wireless network in the available wireless network set, wherein the indication information comprises the terminal identifier and all or a part of the available wireless network set, wherein the determining, by the network decision device, the network trigger device based on an attach status of the terminal, and sending the indication information to the determined network trigger device comprises: determining, by the network decision device, a target wireless network from the available wireless network set; determining, by the network decision device, the network trigger device based on the attach status of the terminal and the target wireless network; and sending, by the network decision device, the indication information to the determined network trigger device, wherein the indication information comprises the terminal identifier and the target wireless network, and wherein the network decision device is a policy control device obtaining the terminal identifier and the service information from an application function device or a packet detection device, the policy control device being a policy control function, PCF, device or a policy and charging rules function, PCRF, device. determining, by the network decision device, a target wireless network from the available wireless network set; determining, by the network decision device, the network trigger device based on the attach status of the terminal and the target wireless network; and sending, by the network decision device, the indication information to the determined network trigger device, wherein the indication information comprises the terminal identifier and the target wireless network, and wherein the network decision device is a policy control device obtaining the terminal identifier and the service information from an application function device or a packet detection device, the policy control device being a policy control function, PCF, device or a policy and charging rules function, PCRF, device.