As far as the composition of the computer is concerned, the host, the monitor, and the peripherals are a computer. The terminal is an integral part of the computer and is the input and output device of the computer system. Network terminal devices will not be limited to the traditional desktop application environment, with the diversification of connection methods, it can be used as a desktop device, but also can be used in mobile and portable ways, terminal devices will have diversified product forms; In addition, with the expansion of cross-platform capabilities, in order to meet the needs of different system applications, network terminal devices will also appear in many faces: Unix terminal, Windows terminal, Linux terminal, Web terminal, Java terminal and so on.