An image processing system temporarily stores, as processing target captured images, captured images whose image-capturing positions are included in a predetermined region. The system calculates similarity degrees of the processing target captured images, selects the processing target captured images whose similarity degrees are different from each other as useful images, and extracts image feature points from each of the useful images. The system generates image feature point data that includes the extracted image feature points, generates reference data used when scenic image recognition is performed by associating the generated image feature point data with an image-capturing position at which the image is captured to obtain the captured image corresponding to the image feature point data, and creates a reference data database.