The present invention relates to a TV dual screen control method for preventing a user's screen confusion by automatically selecting a screen that a viewer wants to watch and outputting a voice according to the screen selected by the user as the user moves the boundary line. In a TV having a dual screen function capable of scaling, moving a boundary of a dual screen in a predetermined direction and a predetermined ratio according to a user's dual screen boundary change command, and outputting a sound according to a screen widened according to the movement of the boundary line. Step, if one screen of the dual screen occupies the set area of the total screen area, including the step of reducing the brightness of the other screen can improve the user's selection satisfaction to differentiate the product.
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