DATA MANAGEMENT SYSTEM

[Problem] Eliminating redundancy of measurement data (50 to 54, 70) detected by sensors (20 to 25) to achieve reduction in disk capacity.[Solution] Provided are an AP node (12, 14) to which a plurality of sensors (20 to 25) is connected; and a DB node (16, 18) connected to the AP node (12, 14). The AP node (12, 14) includes: a means that receives measurement data (50 to 54, 70) including values of a plurality of measurement items output from each of the sensors (20 to 25); a queue (30) that stores a most recent value in units of measurement items of each of the sensors (20 to 25); a means that refers to the queue (30) and then determines whether the value of each of the measurement items has changed, every time the measurement data (50 to 54, 70) is output from each of the sensors (20 to 25); a means that, in a case where there is a measurement item having a value change, generates storage data including the value of the measurement item for each of the measurement items and that transmits the generated data to the DB node (16, 18); and a means that overwrites the most recent value in the queue (30) with a newest value of the measurement item. The DB node (16, 18) includes: a plurality of tables (42a to 44f) that stores a value included in the measurement data (50 to 54, 70) for each of the measurement items of each of the sensors (20 to 25); and a means that stores the storage data transmitted from the AP node (12, 14) in a corresponding table (42a to 44f).