We developed a visualization tool of real-time GNSS time-series for the real-time crustal deformation monitoring. The developed system can draw the real-time GNSS time-series based on the user requirement in Web browser. The user can change drawing range of the time-series by graphical user interface. The drawn time-series is update automatically based on the processed GNSS time-series. These features will be useful for the actual crustal deformation monitoring by the realtime GNSS processing.