A foldable display device comprising: a display unit configured to output a scroll input signal by sensing a user's touch and including first and second display areas split spatially or visually by folding of the display unit; a folding sensor unit configured to: sense full folding, full unfolding and intermediate folding of the display unit, and output a state signal related to a folding level of the display unit, the intermediate folding being state of the display unit between the full unfolding and the full folding; and a controller configured to: display a webpage across the first display area and the second display area on the display unit, control the webpage displayed on the display unit by receiving the scroll input signal, monitor a state of the display unit by receiving the state signal from the folding sensor unit, and control an entire portion of the webpage displayed across the first display area and the second display area to be scrolled in response to the scroll input signal sensed from the second display area when the webpage is displayed across the first display area and the second display area in the state of full unfolding, hereinafter, 'first mode', characterized in that the controller is further configured to control a first portion of the webpage displayed on the first display area to be not scrolled and control a second portion of the webpage displayed on the second display area to be scrolled in response to the scroll input signal sensed from the second display area when the state of full unfolding has been switched to the state of intermediate folding, hereinafter, 'second mode'. a display unit configured to output a scroll input signal by sensing a user's touch and including first and second display areas split spatially or visually by folding of the display unit; a folding sensor unit configured to: sense full folding, full unfolding and intermediate folding of the display unit, and output a state signal related to a folding level of the display unit, the intermediate folding being state of the display unit between the full unfolding and the full folding; and a controller configured to: display a webpage across the first display area and the second display area on the display unit, control the webpage displayed on the display unit by receiving the scroll input signal, monitor a state of the display unit by receiving the state signal from the folding sensor unit, and control an entire portion of the webpage displayed across the first display area and the second display area to be scrolled in response to the scroll input signal sensed from the second display area when the webpage is displayed across the first display area and the second display area in the state of full unfolding, hereinafter, 'first mode', characterized in that the controller is further configured to control a first portion of the webpage displayed on the first display area to be not scrolled and control a second portion of the webpage displayed on the second display area to be scrolled in response to the scroll input signal sensed from the second display area when the state of full unfolding has been switched to the state of intermediate folding, hereinafter, 'second mode'. sense full folding, full unfolding and intermediate folding of the display unit, and output a state signal related to a folding level of the display unit, the intermediate folding being state of the display unit between the full unfolding and the full folding; and a controller configured to: display a webpage across the first display area and the second display area on the display unit, control the webpage displayed on the display unit by receiving the scroll input signal, monitor a state of the display unit by receiving the state signal from the folding sensor unit, and control an entire portion of the webpage displayed across the first display area and the second display area to be scrolled in response to the scroll input signal sensed from the second display area when the webpage is displayed across the first display area and the second display area in the state of full unfolding, hereinafter, 'first mode', characterized in that the controller is further configured to control a first portion of the webpage displayed on the first display area to be not scrolled and control a second portion of the webpage displayed on the second display area to be scrolled in response to the scroll input signal sensed from the second display area when the state of full unfolding has been switched to the state of intermediate folding, hereinafter, 'second mode'. display a webpage across the first display area and the second display area on the display unit, control the webpage displayed on the display unit by receiving the scroll input signal, monitor a state of the display unit by receiving the state signal from the folding sensor unit, and control an entire portion of the webpage displayed across the first display area and the second display area to be scrolled in response to the scroll input signal sensed from the second display area when the webpage is displayed across the first display area and the second display area in the state of full unfolding, hereinafter, 'first mode', characterized in that the controller is further configured to control a first portion of the webpage displayed on the first display area to be not scrolled and control a second portion of the webpage displayed on the second display area to be scrolled in response to the scroll input signal sensed from the second display area when the state of full unfolding has been switched to the state of intermediate folding, hereinafter, 'second mode'.