A data management method is disclosed. The data management method includes receiving input image data including a plurality of frames, sorting a type of a frame included in the input image data, and erasing one or more I-frames among the plurality of frames included in the input image data or erasing at least a portion of data corresponding to the one or more I-frames among the plurality of frames included in the input image data. Thus, the data management method stores a low amount of image data in a limited storage space while minimizing loss of the image data, thereby effectively storing and managing data.