To provide a comment information sharing method for a document sharing system adapted to allow addition of a comment to a disclosed document, in which a lot of users' accurate evaluations for the comment can be obtained while reducing the load of evaluation operation in order to obtain evaluations for the comment from many users, and information for the comment can be satisfactorily shared.

At the time of adding a new comment to the disclosed document, a comment type thereof is selected, whereby answer choices of an evaluation scale most suitable to evaluate the comment type is determined. Suitable answer choices are displayed on an information screen for each comment so as to be easy for each user to think and evaluate. Therefore, evaluations can be obtained from many users. When one of the answer choices is selected in an evaluation selection column for each comment, 1 is added to the corresponding selection frequency accumulated value to organize the evaluations for the comment concerned.