Plate-shaped cover material comprising an elastomeric layer and a plastically deformable metal mesh or metal plate, the elastomeric layer consisting of a glue or joint sealant cured to an elastomer and having strong adhesion to the metal mesh or the metal plate. Therefore, the section modulus of the rear case in terms of the strength of materials can be large, and thus deterioration of the rigidity can be prevented even in the case the device main body is made thinner. IP packets are also routed within a second ISP’s domain from single network device with a second database. An alignment of liquid crystal molecules varies according to voltage applied on the electrodes.