1. A display apparatus comprising: an image display that displays an image on a display screen; a touch location detector that detects a touch location touched by an operator on the display screen; a transfer length calculator that calculates a transfer length from a touch start point to a touch end point touched by the operator that moves while touching the display screen, based on a detection result of the touch location detector; a transfer length judger that judges whether the transfer length calculated by the transfer length calculator is greater than a predetermined reference transfer length; a location shift calculator that calculates a shift in location touched by the operator with respect to a straight line from the touch start point to the touch end point, based on the detection result of the touch location detector; a location shift judger that judges whether the location shift calculated by the location shift calculator is less than a predetermined reference location shift; and a screen split controller that controls the image display so that the display screen is split when the transfer length judger judges that the calculated transfer length is greater than the reference transfer length and the location shift judger judges that the calculated location shift is less than the reference location shift.