Abstract: An image display device according to one embodiment of the present invention includes a touch sensing unit that senses a touch input, a display unit to which a window on which content is displayed is output, and a controller that, when the touch input for entering a division mode is sensed, outputs at least one or more imaginary division lines along which the display unit is divided, to a position that is according to a predetermined reference, considering the number of window regions that are output to the display unit before entering the division mode, and when the touch input that confirms the imaginary division line is sensed, divides the display unit into multiple divisional regions along the imaginary division line and outputs the items of content displayed on the window regions to the multiple divisional regions, respectively, according to a predetermined reference.