12. A feature information collecting method, comprising: acquiring vehicle position information that represents a current position of a vehicle; acquiring image information for a vicinity of the vehicle; carrying out image recognition processing on recognition target objects that are included in the image information; storing recognition information that represents a result of the image recognition of the recognition target objects in association with information for the recognition position of the recognition target objects, the recognition position determined based on the vehicle position information; and extracting, as learned features, recognition target objects that can be repeatedly recognized by image recognition based on a plurality of sets of recognition information related to the same position, the plurality of sets of recognition information being stored due to the image information for the same position being recognized a plurality of times by image recognition; wherein the recognition information is a characteristic amount represented by at least one of a noise amount and an amount of extractions of edge included in the image information.
15. The feature information collecting method according to claim 12 , wherein: the recognition information is stored in association with predetermined conditions including information about at least one of recognition time and weather during the recognition; and the method further comprises extracting recognition target objects that can be repeatedly recognized by image recognition during the predetermined conditions as limited learned features that are valid only when the conditions are satisfied.