PROBLEM TO BE SOLVED: To make it possible to automatically generate a change region of a forest from an aerial photograph etc. with high accuracy.SOLUTION: A forest phase analyzer comprises: a statistic distribution creation unit 26; and a change region detection unit 28. The statistic distribution creation unit 26 sets an attention region in an original image which is obtained by photographing a target region from the sky at a second period corresponding to each forest phase region of the target region including the forest in an existing forest phase segment map at a first period so that statistic distribution of characteristic information with respect to the image extracted by a prescribed element region in an attention region of each forest phase is obtained. The change region detection unit 28 detects outlier in the statistic distribution of each attention region and regards the element region providing the outlier as the change region where the forest phase is changed in the attention region between the first period and the second period.
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