PROBLEM TO BE SOLVED: To provide a coming flying possibility score calculation method for each of plural creatures which have different habitat suit-ability.SOLUTION: A coming flying possibility score calculation method comprises: a green space database preparation step for, digitizing an area for each green space unit covered with a green space of a target domain and a ratio of a vegetation type； a habitat condition database preparation step for digitizing a score of area covered with the green space for each kind of a creature coming flying, a vegetation type score and a home range； a selection step S201 for selecting the green space unit； a step S202 for calculating an availability score for each kind of the creature coming flying based on the habitat condition database on the selected green space unit； a step S203 for calculating a selection possibility score for each kind of the creature coming flying on the basis of the green space database and the habitat condition database on the selected green space unit； and a step S204 for calculating a coming flying possibility score for each kind of the creature coming flying on the basis of the availability score calculated by the availability score calculation step, and the selection possibility score calculated by the selection possibility score calculation step.
