Provided are a method, apparatus, and medium for encodingdecoding a high frequency band signal by using a low frequency band signal corresponding to an audio signal or a speech signal. The corner connection structure has logs with overlap portions shaped so that the overlap portions of the logs of a first wall overlap and alternately interlace the overlap portions of the logs of a second wall. The image-creating unit has an image-forming region and forms an image on a medium. The exchange metal is from nickel, cobalt, iron, manganese, molybdenum, and combinations thereof, and the non-exchange metal is from silver, copper, tin, bismuth, lead, antimony, arsenic, indium, zinc, germanium, gold, cadmium, beryllium, and combinations thereof.