An annotation management system that manages annotation data, which is information related to an annotation of an electronic document, includes a browser 41 that displays the electronic document, executes an electronic document addition program added to the electronic document, and accepts user input. The client 4, the document server 2 that stores the electronic document, the database 5 that manages the annotation data for each electronic document, and the selected electronic document that is the electronic document requested by the client 4 is acquired from the document server 2 The document conversion server 3 generates a converted electronic document in which an electronic document addition program for inputting and displaying data is added to the selected electronic document, and distributes the converted electronic document to the client 4.
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