The present disclosure discloses a device and method for processing slice data. The method comprises: sending a download request for slice data adjacent to the newest continuous data to a server, determining whether or not a adjacent slice interval is filled with the slice data returned by the server; if yes, inserting the returned slice data into a database, setting the displaying mark thereof as valid, setting the displaying mark of downloaded data between the adjacent slice interval and the next slice interval to the adjacent slice interval as valid, and deleting the adjacent slice interval from the database; if not, inserting the returned slice data into the database, setting the displaying mark thereof as valid, and amending the border of the adjacent slice interval. The technical scheme of the present disclosure can obtain slice data from the server and fill the slice data in a corresponding slice interval according to a recorded slice interval set, and the data displayed to users is always the newest continuous data.