1. A method of reproducing an image of an image file on an electronic map including the image file so that position information of the image file matches position information on the electronic map, the method comprising the steps: (a) receiving a selection of a target point to be observed on the electronic map on a display of a computer comprising a processor and obtaining position information of the target point; (b) setting a search range within the displayed electronic map; (c) searching for image files including an image of the target point within the set search range using the processor; and (d) displaying images of searched image files overlaid on top of the electronic map via the computer display; wherein step (b) comprises setting the search range within a predetermined radius range based on the target point; and wherein the predetermined radius range varies based on an altitude of an image taken at the target point.