[Solution] This system is a computer-based system for simulating the effect of a specific surgical treatment method on the basis of three-dimensional shape data of a targeted blood-vessel site in a subject, wherein the computer comprises: a treatment method accepting unit that three-dimensionally displays three-dimensional shape data of a targeted blood-vessel site on a display and accepts the designation of a lesion on the display and the selection of a surgical treatment method with respect to the lesion； a correction method storage unit that stores, in advance in a memory, selectable treatment methods and methods for correcting the three-dimensional shape data according to the respective treatment methods； and a corrected three-dimensional shape output unit that retrieves the correction method stored in the correction method storage unit on the basis of the selection of the treatment method, corrects the three-dimensional shape data of the designated lesion in accordance with the correction method, and outputs the corrected three-dimensional shape data.
