Disclosed is a method of managing an image display apparatus of the present invention. The method includes the steps of: (a) obtaining a first information on a predetermined output image format; (b) obtaining a second information on an input image format and a data broadcasting contents format; (c) comparing the first information on the predetermined output image format with the second information on the input image format and the data broadcasting contents format; (d) controlling output modes of the input image format and the data broadcasting contents format according to the predetermined output image format based on a comparison result of the output image format, the input image and the data broadcasting contents format performed by the comparing unit; and (e) outputting on image display unit the input image and the data broadcasting contents output modes of which are processed.