Wireless sensor networks allows measurement of environment data from various areas, especially difficult-to-access places, and report those data to users. This paper presents Wireless Sensor Network Manager with Real-time and Historical Visualization, It monitors real-time status of sensor nodes and network connectivity, as well as environment data, via web interface. Historical data can also be retrieved and visualized. Data and status are displayed on web interface in form of graphs and diagrams in order to make them easy to understand by both technical and non-technical users.  Hypothetical scenarios based on measuring rainfall and light intensity for monitoring landslide situation presented to demonstrate core features of the system.