A method of making chalcogenide glass which utilizes liquid encapsulation to prevent the evaporation loss of low boiling point or high vapor pressure glass components while the glass melt is being processed. In a search, a main point value indicated in each of meta data in music information files respectively corresponding to pieces of music registered in the play list is compared with a target tempo value. The first and second resist layers are formed with openings therein at positions corresponding to the electrical connection pads and metal bumps, and the exposed conductive layer is removed.