Data conversion apparatus, system, and method

A data conversion apparatus for converting data acquired by an edge device attached to a monitoring target, the data conversion apparatus comprising:

• a storage unit configured to store monitoring target management information in which the monitoring target is associated with a controller type representing a type of a controller configured to control the monitoring target, and data conversion rule information in which a data set in units of the controller type is registered, the data set in units of the controller type defining a conversion rule indicating a data conversion method for the controller type;
• and
• a calculation unit including a cache memory and capable of executing a software program for implementing data conversion using the information stored in the storage unit, wherein
• the calculation unit loads the data conversion rule information into the cache memory, specifies a monitoring target corresponding to the data received from the edge device, specifies a controller type corresponding to the specified monitoring target by referring to the monitoring target management information, reads a conversion rule corresponding to the specified controller type from the cache memory, and converts the data using the conversion rule.