1. A document analysis system comprising: a processor, the processor functioning as: an input unit that receives a document, the document comprising one of structured document or a semi-structured document, renders the received document, and stores the rendered document as an image in a storage unit; a basic layout analysis unit that groups document description elements of the document included in the image that are juxtaposed in a horizontal or vertical direction in the image, relates the grouped document description elements to layout components of the document that describe a layout of the document description elements of the document, and stores the related grouped document description elements and layout components in the storage unit; and an output unit that outputs the layout based on the stored related grouped document description elements and layout components, the layout identifying the layout components, the layout components referencing the grouped document description elements.