Provided is a new catalyst structure for exhaust gas treatment including an upper catalyst layer and a lower catalyst layer, in which the catalyst structure can sufficiently exhibit functions as a three way catalyst while maintaining gas diffusibility. Each panel is mounted to a pair of beams along opposite side edges to bridge between two adjacent beams. The handle is allowed to have a state in which it is contained in the concave portion by its elastic force. A map information retrieving means retrieves a map database under the conditions of the interested place information and the range condition storing in the user interested place database, and obtains information such as a list of building names, and place names, and so on within the range from the map database. The apparatus further includes a magnetic field generator configured to provide a magnetic field during dendritic web growth.