Provided is a method for displaying a region to be checked of a sealant pattern formed on a motherboard, including inputting referrence pattern data; storing data concerned with a distance between a coating surface of the motherboard coated with sealant and a nozzle arranged in a coating head unit, wherein the distance is measured continuously by a measuring unit arranged in the coating heat unitwhen the coating head unit is moved according to inputted referrence pattern data; shifting the nozzle up and down according to the data concerned with the distance to hold a gived distance between the coating surface and the nozzle to discharge the sealant, so as to form a sealant pattern corresponding to the inputted referrence pattern data; and displaying a distance image based on the data concerned with the distance and a pattern image based on the referrence pattern data, wherein the pattern image is used as background. The invention has an advantage of conveniently and rapidly displaying a region to be detected of the sealant pattern formed on the motherboard.