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 selectively extracting a still image from a video image of the transmitted image; and a visual range computing unit recognizing a coordinate of a similar color region from an image visual range function and the geometrical information of the image, performs distance-mapping on an analytic region of the image received from the IP camera, determines the image visual range function from a zero distance, a coordinate visual range efficiency coefficient, a perspective coefficient, a correction factor of an image visual range, and a distance per y-coordinate of an object positioned furthermost in the analytic region of an image with the distance for the coordinate represented, and calculates the visual range using the image pattern recognition method.