An interference avoiding device for determining occurrence of an interference in a robot operation in advance and automatically avoiding the interference, to be suitably applied to an automatic picking-up operation of randomly stored workpieces. First, a magnetic-pole cycle value is accumulated. More preferably, the information bits and the check bits are divided into M sub blocks to form a Hamming code block. The mounting arrangement includes utilizing the mounting enclosure to mount an apparatus with supersonic oxidizing gas lancing capability and an injector for particulate carbon in an electric arc furnace. The client is authenticated by comparing the login information with authentication information maintained by the authentication server. A suitable bit plane is selected from among the plurality of bit planes and the information sought to be hidden is inserted into the image creating a steganographic image.