A system including a video display device (110, 1600) and an external device capable of recording video, wherein the video display device is configured to display a video recorded by the external device, the video display device comprising: a communication unit configured to access the external device and acquire a video including rotation information that indicates a rotation angle of a plurality of frames of the video recorded from the external device, wherein the rotation information is acquired based on the horizontal line or horizon forming a right angle with the direction of the earth gravity within the recorded images, a display unit displaying the video; and a processor setting up a video playback mode, wherein the video playback mode includes a natural display mode displaying the acquired video without performing a rotation compensation based upon the rotation information, and a horizontal display mode displaying the acquired video performing the rotation compensation based upon the rotation information, wherein, when the video playback mode corresponds to the horizontal display mode, the video display device performs the rotation compensation of a plurality of sequential frames of the video based upon the rotation information, and displays each of the plurality of sequential frames of the video cropped to a size, wherein, when both a first condition and a second condition are satisfied, the video display device displays a playback mode reset interface configured to allow the user to reset the set video playback mode to the other playback mode, wherein the first condition means in the natural display mode that frames having a rotation angle equal to or exceeding a predetermined angle are displayed and in the horizontal display mode means that frames having a rotation angle less than a predetermined angle are displayed, and wherein the second condition means that the state of the first condition lasts for more than a predetermined time interval during the display of the video, wherein a cropping size is decided based upon the rotation information of the plurality of sequential frames of the video, and wherein the cropping size is determined based upon a frame having a minimum crop area, among the plurality of frames of the video, based upon the rotation information. a communication unit configured to access the external device and acquire a video including rotation information that indicates a rotation angle of a plurality of frames of the video recorded from the external device, wherein the rotation information is acquired based on the horizontal line or horizon forming a right angle with the direction of the earth gravity within the recorded images, a display unit displaying the video; and a processor setting up a video playback mode, wherein the video playback mode includes a natural display mode displaying the acquired video without performing a rotation compensation based upon the rotation information, and a horizontal display mode displaying the acquired video performing the rotation compensation based upon the rotation information, wherein, when the video playback mode corresponds to the horizontal display mode, the video display device performs the rotation compensation of a plurality of sequential frames of the video based upon the rotation information, and displays each of the plurality of sequential frames of the video cropped to a size, wherein, when both a first condition and a second condition are satisfied, the video display device displays a playback mode reset interface configured to allow the user to reset the set video playback mode to the other playback mode, wherein the first condition means in the natural display mode that frames having a rotation angle equal to or exceeding a predetermined angle are displayed and in the horizontal display mode means that frames having a rotation angle less than a predetermined angle are displayed, and wherein the second condition means that the state of the first condition lasts for more than a predetermined time interval during the display of the video, wherein a cropping size is decided based upon the rotation information of the plurality of sequential frames of the video, and wherein the cropping size is determined based upon a frame having a minimum crop area, among the plurality of frames of the video, based upon the rotation information.