The authors view a document as a multi modal media in the sense that it presents information by using figures and/or images as well as text. By showing examples of media conversion and media integration, the authors discuss the essential processing techniques of media information, especially document media information. First, media conversion is briefly addressed by an example of converting a graph diagram in a document to either an alternative graph diagram or a table. The main topic is the generation of a manual of a mechanical parts assembling as an example of media integration in a document. Thereby, necessary input information is presented for generating the manual.