Failure storage device and failure storage method

A failure storage device comprising:

• a data detection unit configured to detect data indicating a condition of a target to be controlled;
• a storage unit configured to store the data;
• a failure detection unit configured to detect a failure of the target to be controlled;
• and
• a failure storage control unit configured to, when the failure is detected, carry out failure storage processing to select data to be stored depending on a failure detail of the failure detected and store the selected data in the storage unit,
• in the failure storage processing, the failure storage control unit controlling the storage unit to store a failure detail of an initial failure detected first and data selected in accordance with the failure at a time of occurrence of the initial failure, and then, when another one or more failures are detected during measuring a prescribed period of time, to store only a failure detail of each failure other than the initial failure and store neither a failure detail nor data of a failure detected after a lapse of the prescribed period of time.