An oven, is provided that includes multiple heat transfer means, including convection and microwave heat transfer means. The parameter for abstractly representing the traveling condition of the vehicle includes, for example, a hardeasy parameter representing a hardeasy condition. It is designed to be approximately the size of a block of commercially available tofu. The present invention novel frictional engagement further provides a more uniform torque transfer between the two components. The M pieces of quantized data includes quantized data corresponding to an edge portion of the recording element group and quantized data corresponding to a central portion of the recording element group, and a recording duty of the quantized data corresponding to the edge portion is set lower than a recording duty of the quantized data corresponding to the central portion.