PURPOSE: To perform printing by respectively applying necessary printing data to a plurality of output destinations only by processing printing data collected as a whole.

CONSTITUTION: The printing data 32 formed by a printing data forming device 31 is inputted to a printing data processor 35. An output destination or a printing form, printing resources or the like are specified from a table on the basis of key data wherein the printing data of one file is contained at every page to be outputted to the corresponding printer among printers 331.... The output of a classifying page can be also performed and, in this case, before the corresponding printing data is outputted, the classifying page is outputted to the printer 33 to perform the insertion of classifying paper. The same page of printing data is copied and printed matter can be outputted to a different output destination while the form or font of printing is changed or a part of a compsn. is corrected.