In the rivers area, it has become frequent problems with illegal dumping, flood, inundation, and damage. We need the support and understanding of the problems quickly. Future measures also require. River basin is a wide range. Only the river administrator is difficult to perform adequate monitor and response. River Information Management System was developed by the collaboration with the Ministry of Land, Infrastructure and Transport Chubu Regional Development Bureau Shonai River river office In order to strengthen the monitoring of the river. River Information Management System is composed of a Post Management System and River Information Applications. River Information Application is an application using the GPS function and camera functions of the smartphone. Post Management System is a system for managing the problems by river administrator.