PROBLEM TO BE SOLVED: To provide an annotation method, an annotation program and an annotation device for specifying a position on content where annotation is restored even when the content is changed.SOLUTION: A computer 10 stores an annotation position on content as first structure position information, feature structure position information and first feature information in a DB. In the case of restoring an annotation, when any object node is not specified by first retrieval based on first structure position information with respect to the tree structure of the content, the computer 10 performs second retrieval based on the feature structure position information, and when one object node is specified, the computer 10 restores annotation, and when two or more object nodes are specified, the computer 10 extracts second feature information for every object node, and compares the first feature information with the second feature information, and specifies the object node of the second feature information whose degree of matching with the first feature information is high to restore the annotation.
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