Homologous judgment and differential display method and system for composite document

The invention provides a homologous judgment and differential display method and system for a composite document, and the method comprises the steps: carrying out the preprocessing of the composite document, and respectively extracting embedded files of the composite document; searching version tracking information in the embedded file, and extracting and respectively forming version tracking information sets of the composite document; in response to the fact that the version tracking information sets of any two composite documents have an intersection, regarding that the any two composite documents are homologous; further defining a display style of the difference part of the homologous composite document; and inserting a display style into the difference paragraph element corresponding to the version tracking information of the composite document needing to display the difference, and opening the difference part of the display style displayed by the composite document. Whether different files have an associ