The invention discloses a screen refreshing device and a method based on a syncretic communication terminal, belonging to the technical field of the structure of the screen refreshing device and the screen refreshing method which are based on the syncretic communication terminal and can improve the procedure response speed in the information or communication technology. The screen refreshing device comprises a GUI (graphic user interface) module, an LCD (liquid crystal display) screen refreshing module and an LCD drive module; through increasing the LCD screen refreshing module, the screen area needing to be refreshed is cut into a plurality of small rectangular areas, and the dot matrix data of the small areas are written into the LCD one by one through the LCD drive module at regular time. Since the screen area needing to be refreshed is cut into a plurality of small rectangular areas, the time for refreshing the small areas cannot influence the processing on other service modules,thus promoting the procedure response speed.