The present invention applies a building energy efficiency rating to some areas according to the land use during urban planning, and calculates the energy consumption by applying the energy load to the rest, thereby more accurately grasping energy demand and combining energy consumption and cost efficiency. There is an advantage of being able to select the optimal energy supply plan in consideration. In addition, it is possible to grasp the energy demand differentiated by building energy efficiency class, and accordingly, the size of energy facilities can be differentiated. In addition, it is possible to set a target value for the energy efficiency level of a city building, and to plan the amount of energy supply that satisfies the target value. In addition, by reviewing the life cycle cost, carbon emission cost, and increase/decrease cost when applying the building energy efficiency class for each alternative, the final energy supply plan can be selected in consideration of both energy consumption and cost efficiency.
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