A display apparatus configured to rotate a display between a horizontal landscape direction and a vertical portrait direction, the display apparatus comprises: the display; a driver for rotating the display of the display apparatus between the horizontal landscape direction and the vertical portrait direction; a communicator comprising circuitry connectable with an electronic apparatus; a processor configured to, when the electronic apparatus is connected to the display apparatus: receive an image from the connected electronic apparatus, which received image includes blank regions; identify black regions in the received image and determine that regions corresponding to the black regions are blank regions by analyzing a color value of the image or using an edge detection algorithm; obtain, from the electronic apparatus, identification information of the electronic apparatus and identify an image ratio corresponding to the identification information based on pre-stored information on image ratios for each of plural external electronic apparatuses, crop, based on the identified image ratio, a remaining region obtained from the received image by excluding the blank regions from the received image, and scale a resolution of the cropped image to correspond to a resolution of the display. the display; a driver for rotating the display of the display apparatus between the horizontal landscape direction and the vertical portrait direction; a communicator comprising circuitry connectable with an electronic apparatus; a processor configured to, when the electronic apparatus is connected to the display apparatus: receive an image from the connected electronic apparatus, which received image includes blank regions; identify black regions in the received image and determine that regions corresponding to the black regions are blank regions by analyzing a color value of the image or using an edge detection algorithm; obtain, from the electronic apparatus, identification information of the electronic apparatus and identify an image ratio corresponding to the identification information based on pre-stored information on image ratios for each of plural external electronic apparatuses, crop, based on the identified image ratio, a remaining region obtained from the received image by excluding the blank regions from the received image, and scale a resolution of the cropped image to correspond to a resolution of the display. receive an image from the connected electronic apparatus, which received image includes blank regions; identify black regions in the received image and determine that regions corresponding to the black regions are blank regions by analyzing a color value of the image or using an edge detection algorithm; obtain, from the electronic apparatus, identification information of the electronic apparatus and identify an image ratio corresponding to the identification information based on pre-stored information on image ratios for each of plural external electronic apparatuses, crop, based on the identified image ratio, a remaining region obtained from the received image by excluding the blank regions from the received image, and scale a resolution of the cropped image to correspond to a resolution of the display.