An object is to provide a land use support system and a land use support method capable of estimating the cost for land use at a low cost. An undulation state of a planned installation site 50 is estimated based on an interface unit 12 connectable to the Internet network 3 and GIS data acquired via the Internet network 3, and further, based on the estimated undulation state. A GIS data processing unit 13 for setting a creation area that requires creation work in the planned installation site 50, a creation planning part 14 for calculating construction costs for the creation work, an interface unit 12, a GIS data processing unit 13, and a creation planning part 14, a land use support system 1 including a control device 10 having a control unit 11 that controls 14 and a land use support method executed by the control device 10. [Selection] Figure 1
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