Data processing apparatus for imparting priority to either nullification of processed data or processing of non-processed data

Abstract

A data processing apparatus receives and stores data, and then performs processing such as the output of the stored data. The data processing apparatus nullifies already-processed data by means of deletion or overwrite. The data processing apparatus displays a reception screen for receiving from a user a priority instruction for either a processing-speed oriented priority where priority is imparted to the processing of data or a security oriented priority where priority is imparted to the nullification of data. When the security oriented priority is instructed, the data processing apparatus performs the nullification of data immediately after the processing of the data. When the processing-speed oriented priority is instructed, the data processing apparatus performs with priority the processing of data. Then, when not-yet-processed data has been completed, or alternatively after a user has left the site, the data processing apparatus performs the nullification of already-processed data.