A document processing apparatus according to the present invention capable of changing a layout of a document dynamically in accordance with data to be laid out in the document, comprises a storage unit to store a template which contains a plurality of combinations of region information representing a region to lay out data and priority order information representing a priority order associated with the region; and a layout unit which lays out the data corresponding to the region in an order represented by the priority order in accordance with the template and changes a size or position of the region in accordance with the data without invading a region associated with a higher priority order than the region, wherein the template stored in said storage unit contains the priority order information independently for each region information.