1. A control method, the method comprising: receiving, by a display device, first data comprising a control instruction over a first dedicated link, wherein the first data is encapsulated at an application layer by a first external device, and matches a data protocol of the first dedicated link; and upon the control instruction being a control instruction directed to the display device, performing, by the display device, a corresponding operation according to the control instruction, and upon the control instruction being a control instruction directed to a second external device, transmitting, by the display device, the first data to the second external device over a second dedicated link, so that the second external device performs a corresponding operation according to the control instruction, wherein the first dedicated link is a link, between the display device and the first external device, set up through an interface component of the display device; and the second dedicated link is a link, between the display device and the second external device, set up through the interface component of the display device; wherein the method further comprises: receiving, by the display device, second data over the first dedicated link, wherein the second data is encapsulated by the first external device at the application layer and matches the data protocol of the first dedicated link, wherein the second data comprises operating state information of the first external device; and encapsulating, by the display device, operating state information of the display device into third data matching the data protocol of the first dedicated link at the application layer, and transmitting the third data to the first external device over the first dedicated link; wherein after receiving, by the display device, the second data over the first dedicated link, the method further comprises: transmitting, by the display device, the operating state information of the display device and the first external device to a background server; receiving, by the display device, a state adjustment instruction obtained by the background server, according to the operating state information of the display device and/or the first external device, wherein the state adjustment instruction includes an instruction to re-configure the display device and/or the first external device, or an instruction to push a service of interest from the display device and/or the first external device; and performing a corresponding operation according to the state adjustment instruction.