A method for accessing a wireless local area network by a first wireless station bridge, comprising: receiving, by the first wireless station bridge, a first Ethernet data frame sent by a first Ethernet device, wherein a source media access control, MAC, address of the first Ethernet data frame is a MAC address of the first Ethernet device connected to the first wireless station bridge; sending by the first wireless station bridge to a wireless access point, correspondence which is between a virtual interface MAC address of the first wireless station bridge, said virtual interface MAC address being one of a plurality of virtual interface MAC addresses of the first wireless station bridge, and the MAC address of the first Ethernet device connected to the first wireless station bridge and wherein the correspondence is received by the wireless access point from the first wireless station bridge, and generating, by the first wireless station bridge, a first wireless local area network data frame according to the first Ethernet data frame, wherein a frame header of the first wireless local area network data frame comprises a transmitter MAC address and a receiver MAC address, and a number of MAC addresses in the frame header of the first wireless local area network data frame is three, and the transmitter MAC address in the frame header of the first wireless local area network data frame is the virtual interface MAC address corresponding to the source MAC address of the first Ethernet data frame, and the virtual interface MAC address is one of a plurality of virtual interface MAC addresses of the first wireless station bridge; sending, by the first wireless station bridge, the first wireless local area network data frame. receiving, by the first wireless station bridge, a first Ethernet data frame sent by a first Ethernet device, wherein a source media access control, MAC, address of the first Ethernet data frame is a MAC address of the first Ethernet device connected to the first wireless station bridge; sending by the first wireless station bridge to a wireless access point, correspondence which is between a virtual interface MAC address of the first wireless station bridge, said virtual interface MAC address being one of a plurality of virtual interface MAC addresses of the first wireless station bridge, and the MAC address of the first Ethernet device connected to the first wireless station bridge and wherein the correspondence is received by the wireless access point from the first wireless station bridge, and generating, by the first wireless station bridge, a first wireless local area network data frame according to the first Ethernet data frame, wherein a frame header of the first wireless local area network data frame comprises a transmitter MAC address and a receiver MAC address, and a number of MAC addresses in the frame header of the first wireless local area network data frame is three, and the transmitter MAC address in the frame header of the first wireless local area network data frame is the virtual interface MAC address corresponding to the source MAC address of the first Ethernet data frame, and the virtual interface MAC address is one of a plurality of virtual interface MAC addresses of the first wireless station bridge; sending, by the first wireless station bridge, the first wireless local area network data frame.