1. An apparatus for measuring a visual range using geometrical information of an image and an image pattern recognition method, the apparatus comprising: an IP camera installed to transmit an image of a measurement site; an image storing unit configured to selectively extract a still image from a video image of the transmitted image; and a visual range computing unit configured to recognize a coordinate of a similar color region from an image visual range function and the geometrical information of the image and to calculate a visual range.