A dissection process estimation device is configured from: a surgery process case database storing case data of surgery processes describing information relating to dissection surfaces corresponding to dissection sites of target organs and progress of dissection a standard dissection process generation unit that reads out case data corresponding to a site to be dissected designated by a user from the surgery process case database and generates a standard dissection surface and a standard dissection process based on plural pieces of read case data an anatomical reference point extraction unit that extracts an anatomical reference point from patient-specific three-dimensional medical image data and a patient-specific dissection process estimation unit that performs matching of the standard dissection surface and the standard dissection process with the patient-specific three-dimensional medical image data and estimates a patient-specific dissection surface and a patient-specific dissection process.
