PROBLEM TO BE SOLVED: To provide a computer device which simulates a defibrillation threshold of an implantable cardioverter defibrillator and a degree of cardiomyopathy caused therefrom, and determines an optimal implantation site.SOLUTION: A computer device includes: storing means for storing data of a human body model whose conductivity for each predetermined site is set； setting means for setting, in the step S120, plural lead indwelling sites at which leads connected to an implantable cardioverter defibrillator body can be indwelt； calculation means for calculating, in the step S130, a defibrillation threshold corresponding to the conductivity set for the human body model and a capacity of receiving cardiomyopathy, for all combinations of plural defibrillator body indwelling sites and the plural lead indwelling sites, and further, obtaining, in the step S140, combinations by which a value of a function becomes a predetermined value, the function including as variables, the defibrillation threshold and the capacity of receiving cardiomyopathy obtained by the calculation； and output means for outputting, in the step S180, a defibrillator body indwelling site and a lead indwelling site for the combination obtained by the calculation means.SELECTED DRAWING: Figure 2
