7. The image search device according to claim 1 , wherein the image feature vector selecting means selects, for each of the plurality of query feature vectors, an image feature vector of which a number is predetermined in ascending order of distance from among a plurality of image feature vectors which respectively indicate a plurality of local features of each of a plurality of search target images to be searched and which are stored in the storage unit in advance.
11. The image search device according to claim 7 , wherein the proximity between the selected image feature vectors and the query feature vector corresponding to the selected image feature vector is a distance between the selected image feature vectors and the query feature vector.