A document generation system generates a plurality of form data of a first file format from document data; converts the plurality of form data of the first file format into a plurality of form data of a second file format; causes a display unit to display the plurality of form data of the converted second file format so as to be able to accept a storage request; and, in response to accepting a storage request for the plurality of form data of the second file format displayed on the display unit, combines the plurality of form data of the first file format corresponding to the plurality of form data of the second file format into data of the first file format and store the combined data in a storage unit.