Embodiments of the invention provide a document outline diagram generation method and system. A document outline diagram comprising display objects corresponding to titles can be generated according to the level attributes of the titles, the owner-member relationships between the titles and the title contents in a document. The display objects are arranged according to the level attributes of the titles and the owner-member relationships between the titles, and the titles with the same level attributes are connected in series, so that a user can visually know an outline structure of the document through the document outline diagram; and the user can easily know the outline structure of the document without browsing the document, so that the user time is saved.