To enable addition, change or deletion of substation equipment symbol that is displayed on a skelton screen by a user using a work PC.

A change display device of skelton screen for power management reads information created by a user with no expertise to enable addition, change or deletion of symbol on a skelton screen, through: a step for creating substation equipment symbol coordinate setting input data based on data input by a user upon setting a coordinate; a step for incorporating the data as substation equipment symbol coordinate data; and a step for causing a skelton screen data creation part to create skelton screen data.