A reforestation project system is provided which is capable of devising and evaluating a reforestation project, the reforestation project comprises a project database for storing reforestation projects; a tree-type database, a condition information-collecting means for collecting the tree diameters and tree heights within local areas in a plurality of proposed reforestation sites input from the terminals; a reforestation site determining means for determining a reforestation site by calculating carbon dioxide absorption amounts at the present point in proposed reforestation sites from the tree diameters and tree heights in the local areas, and selecting a reforestation site having a determined carbon dioxide absorption amount that is smaller than a first threshold; a project devising means for calculating an maximum economic profit and maximum absorption of carbon dioxide when planting area in the reforestation site and the tree-types stored in the tree-type database are respectively changed.
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