This invention is directed to a plant management system that efficiently supports the on-site work of an operator who checks or maintains a structure such as a plant. The plant management system comprises a position acquirer that acquires a position of a terminal, a sensor specifier that specifies a sensor in accordance with the position of the terminal, and a sensor information acquirer that acquires sensor information concerning the specified sensor; and a presenter that presents the sensor information to an operator by superimposing or projecting the sensor information in association with a target to be measured by the specified sensor. Here, the presenter includes a superimposing display unit or a projection device.