A management program, for searching three-dimensional structure data, that causes a computer to perform a procedure comprising: calculating first coordinates of a first point of each of first three-dimensional structures, based on first structure data that includes coordinates of first vertices of a plurality of polygons representing said each of first three-dimensional structures, according to spatial arrangement of the polygons; storing the calculated first coordinates of the first point in a memory device as a piece of information relating to the first structure data corresponding to said each of the first three-dimensional structures; calculating first characteristic quantities of the first structure data corresponding to said each of the first three-dimensional structures based on a first graph produced from the first structure data by using both the first vertices and the first point; calculating second coordinates of a second point of a second three-dimensional structure, based on second structure data specified in a search query; calculating second characteristic quantities of the second structure data based on a second graph produced from the second structure data by using both second vertices and the second point, the second structure data indicating a second three-dimensional structure, the second vertices being included in the second structure data; and searching for one of the first three-dimensional structures similar to the second three-dimensional structure by comparing the first characteristic quantities corresponding to said each of the first three-dimensional structures with the second characteristic quantities corresponding to the second three-dimensional structure, wherein the calculating the first coordinates of the first point is performed based on second-degree moment of inertia of said each of the first three-dimensional structures, with respect to a first center of mass and a first principal component direction of said each of the first three-dimensional structures and the calculating the second coordinates of the second point is performed based on the second-degree moment of inertia of the second three-dimensional structure, with respect to a second center of mass and a second principal component direction of the second three-dimensional structure. calculating first coordinates of a first point of each of first three-dimensional structures, based on first structure data that includes coordinates of first vertices of a plurality of polygons representing said each of first three-dimensional structures, according to spatial arrangement of the polygons; storing the calculated first coordinates of the first point in a memory device as a piece of information relating to the first structure data corresponding to said each of the first three-dimensional structures; calculating first characteristic quantities of the first structure data corresponding to said each of the first three-dimensional structures based on a first graph produced from the first structure data by using both the first vertices and the first point; calculating second coordinates of a second point of a second three-dimensional structure, based on second structure data specified in a search query; calculating second characteristic quantities of the second structure data based on a second graph produced from the second structure data by using both second vertices and the second point, the second structure data indicating a second three-dimensional structure, the second vertices being included in the second structure data; and searching for one of the first three-dimensional structures similar to the second three-dimensional structure by comparing the first characteristic quantities corresponding to said each of the first three-dimensional structures with the second characteristic quantities corresponding to the second three-dimensional structure, wherein the calculating the first coordinates of the first point is performed based on second-degree moment of inertia of said each of the first three-dimensional structures, with respect to a first center of mass and a first principal component direction of said each of the first three-dimensional structures and the calculating the second coordinates of the second point is performed based on the second-degree moment of inertia of the second three-dimensional structure, with respect to a second center of mass and a second principal component direction of the second three-dimensional structure.