A surgery assistance apparatus comprising: a medical image obtainment means that obtains a three-dimensional medical image of a subject to be examined; a target tissue region extraction means that extracts a region of target tissue from the three-dimensional medical image obtained by the medical image obtainment means; an abnormal region extraction means that extracts an abnormal region from the region of target tissue extracted by the target tissue region extraction means; an excision method obtainment means that obtains, based on a plurality of excision region determination conditions, a plurality of excision methods in which excision regions satisfying the respective excision region determination conditions are set for the abnormal region; an excision method presentation means that presents the plurality of excision methods obtained by the excision method obtainment means; characterized in that the surgery assistance apparatus further comprises: a partial excision region extraction means that sets a smallest enclosing body that encloses the abnormal region extracted by the abnormal region extraction means, and extracts a region including the set enclosing body and a portion of a surface of the target tissue, as a partial excision region; and a dominated region extraction means that extracts a tubular structure region from the three-dimensional medical image, and extracts a region including the abnormal region and a part of the tubular structure region extending toward the abnormal region as a dominated region, wherein the excision method obtainment means obtains the excision methods by setting the partial excision region or the dominated region for the abnormal region, wherein an excision region determination condition for setting the partial excision region or the dominated region is a distance between the abnormal region and a surface of the target tissue. a medical image obtainment means that obtains a three-dimensional medical image of a subject to be examined; a target tissue region extraction means that extracts a region of target tissue from the three-dimensional medical image obtained by the medical image obtainment means; an abnormal region extraction means that extracts an abnormal region from the region of target tissue extracted by the target tissue region extraction means; an excision method obtainment means that obtains, based on a plurality of excision region determination conditions, a plurality of excision methods in which excision regions satisfying the respective excision region determination conditions are set for the abnormal region; an excision method presentation means that presents the plurality of excision methods obtained by the excision method obtainment means; characterized in that the surgery assistance apparatus further comprises: a partial excision region extraction means that sets a smallest enclosing body that encloses the abnormal region extracted by the abnormal region extraction means, and extracts a region including the set enclosing body and a portion of a surface of the target tissue, as a partial excision region; and a dominated region extraction means that extracts a tubular structure region from the three-dimensional medical image, and extracts a region including the abnormal region and a part of the tubular structure region extending toward the abnormal region as a dominated region, a partial excision region extraction means that sets a smallest enclosing body that encloses the abnormal region extracted by the abnormal region extraction means, and extracts a region including the set enclosing body and a portion of a surface of the target tissue, as a partial excision region; and a dominated region extraction means that extracts a tubular structure region from the three-dimensional medical image, and extracts a region including the abnormal region and a part of the tubular structure region extending toward the abnormal region as a dominated region, wherein the excision method obtainment means obtains the excision methods by setting the partial excision region or the dominated region for the abnormal region, wherein an excision region determination condition for setting the partial excision region or the dominated region is a distance between the abnormal region and a surface of the target tissue.