This study introduces the drought monitoring system that has been operated since 2000. It serves variations of drought related variables such as intensity, duration, etc. It displays not only spatial but also temporal distribution of every station with daily time step after 1974. This system helps us to detect, early and easily, where and when the drought occurred, and how the drought situation is going. The onset and the withdrawal date of the drought can be defined clearly by this system. Also, it is useful to detect the change of the precipitation climate. The Effective Drought Index (EDI; Byun and Wilhite, 1999), an intensive measure that considers the water accumulation with the weighting function of time passage, is the main idea of the system. Other hydrological variables such as the available water resources index, the flood index, and the estimated precipitation index required to relieve drought are also provided.