A transformation processing system input data including a data record area for storing target date and a transformation processing identification information record area for storing transformation processing identification information about transformation processing executed upon the target data. The transformation processing system includes: a reverse transformation information recording unit which records a target data pointer indicating the data record area in transformed data, a transformation processing identification information pointer indicating the transformation processing identification information record area, and reverse transformation processing identification information about reverse transformation processing; a target data transformation unit which transforms the target data and records it in the data record area; and a transformation processing identification information recording unit which adds the transformation processing identification information about the transformation processing executed by the target data transformation unit to the transformation processing identification information record area in the input data.