A method of operating a chip mounter is provided, comprising: preparing an electronic part on a part supply unit and a printed circuit board on a main body; gripping the electronic part using a part conveyor unit to move the electronic part along a part moving path on the part supply unit and the main body; photographing the electronic part when the electronic part is located at a part recognition region within the part moving path without stoppage and during the movement of the electronic part; transmitting a photographed image of the electronic part to a controller using the image processing unit; comparing the photographed image with a reference image using the controller; and displaying the photographed image to the exterior using the controller; wherein the part recognition region is set by at least one coordinate in the controller to be located on a light source of the processing unit.