Patent ID: 8269989

Claim:
A printing system, comprising: a printing data generating unit that generates printing data and a printing apparatus that conducts printing on the basis of the printing data, with the printing data generating unit and the printing apparatus partially replacing a printing document comprising plural pages, wherein the printing data generating unit comprises a section designating portion that designates a section corresponding to a replacement part included in after-replacement printing data, and wherein the printing apparatus comprises a printing portion that selectively prints printing data of the section designated by the section designating portion, a data accumulating portion that accumulates printing data of predetermined pages that precedes the printing data of the section, a paper feeding portion that feeds a before-replacement printing document, a reading portion that reads the fed printing document, a data comparing portion that compares the read document data with the printing data of the data accumulating portion, a replacement processing portion which, when both match in the predetermined pages, instructs the printing portion to print the printing data of the replacement part corresponding to the section such that a replacement target document of the before-replacement printing document is replaced by the replacement part, and which, when both do not match, causes the before-replacement printing document to be discharged directly from the printing portion, and a first data accumulating portion that accumulates printing data of predetermined pages that are preceded by the printing data of the section, wherein the data comparing portion compares the document data that the reading portion has sequentially read with the printing data of the first data accumulating portion, and wherein when both match in the predetermined pages, the replacement processing portion determines that the replacement target document of the before-replacement printing document has been replaced with the document of the replacement part.