An energy assist system selection support device for supporting the selection of an energy assist system that includes a step-up and step-down chopper unit, an electricity storage unit, and a motor and drives a machine, the energy assist system selection support device comprising: an operation pattern generation unit for generating an operation pattern that factors in an electromechanical configuration; a load pattern generation unit for generating a load pattern pertaining to power consumption in accordance with the generated operation pattern; a data processing unit evaluating the characteristics of the energy assist system to which the generated operation pattern was applied while comparing the characteristics of the energy assist system with a limit value in accordance with the generated load pattern, and generating configuration information including the number of each unit in the energy assist system in accordance with the evaluation results; and a layout unit for laying out each unit in the energy assist system in a virtual space and displaying the result on a display screen in accordance with the generated configuration information.