A method for controlling a first terminal device to access a wireless Local Area Network LAN, wherein the method comprises the following steps carried out by a system comprising a smart device, a network device being a router, and a second terminal device: acquiring, by the smart device, first access information of a wireless LAN, wherein the first access information comprises an SSID and password; validating whether the first access information is correct; and if determining that the first access information is correct, sending, by the smart device, the first access information to the first terminal device such that the first terminal device utilizes the first access information to access the wireless LAN, characterized in that, the validating whether the first access information is correct comprises: sending, by the smart device, an access information forwarding request to the network device, the access information forwarding request at least carrying the first access information, receiving, by the network device, the access information forwarding request sent by the smart device, parsing, by the network device, the access information forwarding request to obtain the first access information, sending, by the network device, the first access information to the second terminal device having accessed the network device, receiving, by the second terminal device, the first access information sent by the network device, detecting, by the second terminal device, whether the second terminal device comprises third access information same with the first access information, the third access information comprising saved SSID and passwords; if the second terminal device comprises saved SSID and passwords same with the first access information, obtaining, by the second terminal device, a correct detection result, sending, by the second terminal device, the correct detection result to the network device, sending, by the network device, the correct detection result to the smart terminal device; and when receiving, by the smart device, the correct detection result as a validation of the SSID and password sent by the network device, determining, by the smart device, that the first access information is correct. acquiring, by the smart device, first access information of a wireless LAN, wherein the first access information comprises an SSID and password; validating whether the first access information is correct; and if determining that the first access information is correct, sending, by the smart device, the first access information to the first terminal device such that the first terminal device utilizes the first access information to access the wireless LAN, characterized in that, the validating whether the first access information is correct comprises: sending, by the smart device, an access information forwarding request to the network device, the access information forwarding request at least carrying the first access information, receiving, by the network device, the access information forwarding request sent by the smart device, parsing, by the network device, the access information forwarding request to obtain the first access information, sending, by the network device, the first access information to the second terminal device having accessed the network device, receiving, by the second terminal device, the first access information sent by the network device, detecting, by the second terminal device, whether the second terminal device comprises third access information same with the first access information, the third access information comprising saved SSID and passwords; if the second terminal device comprises saved SSID and passwords same with the first access information, obtaining, by the second terminal device, a correct detection result, sending, by the second terminal device, the correct detection result to the network device, sending, by the network device, the correct detection result to the smart terminal device; and when receiving, by the smart device, the correct detection result as a validation of the SSID and password sent by the network device, determining, by the smart device, that the first access information is correct. sending, by the smart device, an access information forwarding request to the network device, the access information forwarding request at least carrying the first access information, receiving, by the network device, the access information forwarding request sent by the smart device, parsing, by the network device, the access information forwarding request to obtain the first access information, sending, by the network device, the first access information to the second terminal device having accessed the network device, receiving, by the second terminal device, the first access information sent by the network device, detecting, by the second terminal device, whether the second terminal device comprises third access information same with the first access information, the third access information comprising saved SSID and passwords; if the second terminal device comprises saved SSID and passwords same with the first access information, obtaining, by the second terminal device, a correct detection result, sending, by the second terminal device, the correct detection result to the network device, sending, by the network device, the correct detection result to the smart terminal device; and when receiving, by the smart device, the correct detection result as a validation of the SSID and password sent by the network device, determining, by the smart device, that the first access information is correct.