This invention relates to a document processing apparatus which edits document data which can define a desired section using an original page as a unit of definition. Whether a page break is designated at the section break of the section is determined. If the page break is designated, a blank original page is inserted at the end of a section before the section break so as to lay out the first original page of a section after the section break at the start of a new surface of a print sheet when original pages are laid out in accordance with a designated layout.