A domain name server includes a processor configured to receive a request from a requester for an edge cache address, identify a first edge cache serving content requests to an anycast address from the requester, and determine a load of first edge cache. An interlayer insulating film, and a first etching-stopper film are formed on a semiconductor substrate on which a semiconductor device is fabricated. Therefore, the laundry odor can be quickly removed, and water and power consumption and damage to the laundry, which are caused by a washing operation using the water for deodorization of the laundry, can be prevented.