An electronic document generating apparatus adds, if the same attribute as an attribute of a layer to be processed of an original electronic document is not stored in a layer attribute DB, the attribute to the layer attribute DB, and analyzes an OBJ of a layer of the page to be processed in the original electronic document, and if the OBJ is an OBJ whose size-reduction is not permitted, stores “reduction-inhibited OBJ: ON” in the layer attribute DB as one of the attributes of the layer, and if the OBJ is an OBJ that includes personal data, stores “personal data: ON” in the layer attribute DB as one of the attributes of the layer, and further performs imposition of the page to be processed in the original electronic document according to the content of the layer attribute DB and an imposition method designated by the user.