A mobile terminal, comprising: a wireless processor configured to provide wireless communication; a touch screen; and a controller configured to: display a search bar on the touch screen for searching a video and a specific time point of the video, in response to a first touch input at a touch region of the search bar, display a preview image at a play time point corresponding to the touch region of the search bar, convert the preview image into a plurality of preview images at a plurality of play time points in response to a changed touch degree of the first touch input while playing the video, wherein the plurality of preview images are composed of the preview image and other preview images at play time points before and after the play time point of the preview image, in response to a second touch input being consecutively applied to the search bar when the plurality of preview images are displayed, change a play speed of at least part of the plurality of preview images at a play time point while maintaining play of the video, display information related to the changed play speed on the touch screen, and in response to a single touch input applied to a specific preview image among the at least part of the plurality of preview images, play the video at a play time point corresponding to the specific preview image at the changed play speed. a wireless processor configured to provide wireless communication; a touch screen; and a controller configured to: display a search bar on the touch screen for searching a video and a specific time point of the video, in response to a first touch input at a touch region of the search bar, display a preview image at a play time point corresponding to the touch region of the search bar, convert the preview image into a plurality of preview images at a plurality of play time points in response to a changed touch degree of the first touch input while playing the video, wherein the plurality of preview images are composed of the preview image and other preview images at play time points before and after the play time point of the preview image, in response to a second touch input being consecutively applied to the search bar when the plurality of preview images are displayed, change a play speed of at least part of the plurality of preview images at a play time point while maintaining play of the video, display information related to the changed play speed on the touch screen, and in response to a single touch input applied to a specific preview image among the at least part of the plurality of preview images, play the video at a play time point corresponding to the specific preview image at the changed play speed. display a search bar on the touch screen for searching a video and a specific time point of the video, in response to a first touch input at a touch region of the search bar, display a preview image at a play time point corresponding to the touch region of the search bar, convert the preview image into a plurality of preview images at a plurality of play time points in response to a changed touch degree of the first touch input while playing the video, wherein the plurality of preview images are composed of the preview image and other preview images at play time points before and after the play time point of the preview image, in response to a second touch input being consecutively applied to the search bar when the plurality of preview images are displayed, change a play speed of at least part of the plurality of preview images at a play time point while maintaining play of the video, display information related to the changed play speed on the touch screen, and in response to a single touch input applied to a specific preview image among the at least part of the plurality of preview images, play the video at a play time point corresponding to the specific preview image at the changed play speed.