A mobile terminal, comprising: a touchscreen (151, 400); and a controller configured to: display a playing image of a first video (1612, 1622, 1632) as a main image in a first region of the touchscreen (151, 400), display a video list in a second region of the touchscreen (151, 400) different than the first region while the playing image of the first video (1612, 1622, 1632) is displayed in the first region, the video list comprising a first thumbnail image representing the first video and a second thumbnail image representing a second video, in response to a first proximity touch input to the second thumbnail image, display a playing image of the second video in a window (1624, 1634-1638) as a preview image in the second region, wherein a size of the window (1624, 1634-1638) is set greater than a size of the thumbnail image of the second video and the window (1624, 1634-1638) is displayed in place of the thumbnail image of the second video in the second region while the playing image of the first video is displayed in the first region, in response to a first contact touch input to the second thumbnail image, display the playing image of the second video as the main image, display a progress bar indicating a progress status of the second video displayed as the main image, display a playing image of a first portion of the second video corresponding to a first point of the progress bar as the main image in response to a second contact touch input to the first point of the progress bar, and display a playing image of a second portion of the second video corresponding to a second point of the progress bar as a preview image while the playing image of the first portion of the second video is displayed as the main image, in response to a second proximity touch input to the second point of the progress bar. a touchscreen (151, 400); and a controller configured to: display a playing image of a first video (1612, 1622, 1632) as a main image in a first region of the touchscreen (151, 400), display a video list in a second region of the touchscreen (151, 400) different than the first region while the playing image of the first video (1612, 1622, 1632) is displayed in the first region, the video list comprising a first thumbnail image representing the first video and a second thumbnail image representing a second video, in response to a first proximity touch input to the second thumbnail image, display a playing image of the second video in a window (1624, 1634-1638) as a preview image in the second region, wherein a size of the window (1624, 1634-1638) is set greater than a size of the thumbnail image of the second video and the window (1624, 1634-1638) is displayed in place of the thumbnail image of the second video in the second region while the playing image of the first video is displayed in the first region, in response to a first contact touch input to the second thumbnail image, display the playing image of the second video as the main image, display a progress bar indicating a progress status of the second video displayed as the main image, display a playing image of a first portion of the second video corresponding to a first point of the progress bar as the main image in response to a second contact touch input to the first point of the progress bar, and display a playing image of a second portion of the second video corresponding to a second point of the progress bar as a preview image while the playing image of the first portion of the second video is displayed as the main image, in response to a second proximity touch input to the second point of the progress bar. display a playing image of a first video (1612, 1622, 1632) as a main image in a first region of the touchscreen (151, 400), display a video list in a second region of the touchscreen (151, 400) different than the first region while the playing image of the first video (1612, 1622, 1632) is displayed in the first region, the video list comprising a first thumbnail image representing the first video and a second thumbnail image representing a second video, in response to a first proximity touch input to the second thumbnail image, display a playing image of the second video in a window (1624, 1634-1638) as a preview image in the second region, wherein a size of the window (1624, 1634-1638) is set greater than a size of the thumbnail image of the second video and the window (1624, 1634-1638) is displayed in place of the thumbnail image of the second video in the second region while the playing image of the first video is displayed in the first region, in response to a first contact touch input to the second thumbnail image, display the playing image of the second video as the main image, display a progress bar indicating a progress status of the second video displayed as the main image, display a playing image of a first portion of the second video corresponding to a first point of the progress bar as the main image in response to a second contact touch input to the first point of the progress bar, and display a playing image of a second portion of the second video corresponding to a second point of the progress bar as a preview image while the playing image of the first portion of the second video is displayed as the main image, in response to a second proximity touch input to the second point of the progress bar.