Wireless sensor networks (WSNs) are expected to play an essential role in the upcoming age of pervasive computing. As a new research area, there are several open problems that need to be investigated. One such problem is configuration and management of WSNs. To deploy sensors efficiently in a wide area, we need to consider coverage, purpose and geographic situation. By considering these elements, we can make general deployment strategies. Another issue is management of various sensors in wide area. To handle these issues, we need approaches from different view, management levels, WSN functionalities, and management functional areas. In this thesis, I describe some of the key configuration and management problems in WSNs. Then, I present a newly developed application to address these problems.