1. An image-classifying apparatus comprising: an image information-inputting unit for inputting image information including position information indicating a position where an image was captured; a reference distance-calculating unit for calculating, from the position information, a reference distance between a predetermined reference position and the position where the image was captured; an image-classifying unit for classifying the image utilizing a classification condition based on the reference distance; and a distance difference-calculating unit including a processor, the distance difference-calculating unit for calculating using the processor, from the position information, a distance difference between the position where the image was captured and a position where an image immediately preceding the image was captured, wherein said image-classifying unit is further for classifying the image based on the distance difference, wherein the classification condition includes at least one distance difference threshold for the distance difference, the at least one distance difference threshold varying with the reference distance, and wherein said image-classifying unit is further for classifying the image utilizing the at least one distance difference threshold associated with the reference distance.