Three-dimensional model generation apparatus, three-dimensional model generation method, and program

Provided is a technology capable of generating a three-dimensional model from measured data. A three-dimensional model generation apparatus includes: a storage unit which stores a three-dimensional model of a structure and a three-dimensional measurement value of the structure; a segment generation unit which generates a plurality of segments by dividing the three-dimensional model; a connection relationship specification unit which specifies a connection relationship of the generated plurality of segments; a shape characteristic specification unit which specifies, based on a part of the plurality of segments and other segments of the plurality of segments specified by the connection relationship and connected to the part of the plurality of segments, a shape characteristic of the three-dimensional model formed from the plurality of segments; a shape information specification unit which specifies shape information defining the specified shape characteristic; an orientation specification unit which specifies an orientation of the structure based on a distance between a structure matching the specified shape characteristic and the specified shape information, and the three-dimensional measurement value; and a model generation unit which generates a three-dimensional model based on the specified shape characteristic, the specified shape information, and the specified orientation.