A system and method of automatically controlling a terminal are disclosed. In one aspect, there is a method comprising: installing a sensing device in a terminal; and automatically controlling operations of the terminal when a certain object is detected by the sensing device within a predetermined range. According to certain aspects, a hard disk may be subjected to a full protection, power supplied to peripherals such as a keyboard or a mouse is saved. Furthermore, in other aspects, an automatic power-up/down operation to the terminal, automatic forward and backward operations of a browser and an automatic page-flipping operation of application software may be implemented. In another aspect, there is a control system for the terminal and the terminal equipped with such a control system.