PROBLEM TO BE SOLVED: To comprehend influences on an electric power distribution equipment accompanying increase and decrease of users.SOLUTION: When an electric power distribution equipment is selected from a facility of a power distribution system which includes plural piece of electric power distribution equipment in which the hierarchy is defined, a server 10 identifies one or plural pieces of electric power distribution equipment the hierarchy of which is lower than that of the specific electric power distribution equipment by one. The server 10 further calculates the diversity factor based on the amount of consumption of the electric power in the specified one or plural pieces of electric power distribution equipment.SELECTED DRAWING: Figure 2
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