A video playing device includes a playing unit, a selection unit, a comparison unit, and an acquisition unit. The playing unit is adapted to play a video stored in a memory which is further used for storing a unique identifier of each frame of the video. The selection unit selects two sequential frames of the video from the memory. The comparison unit compares the two selected sequential frame to determine whether the two selected sequential frames are the same, and generates an acquisition signal when it is determined that the two selected sequential frames are not the same. The acquisition unit acquires the unique identifiers of the selected frames from the memory in response to the acquisition signal. The playing unit is further adapted to play the video stored in the memory according to the acquired unique identifiers.