PURPOSE: To remove human mistake by reading identifying information of a product bearer with a reading means provided in a desired process and inputting it in a controlling means by a method wherein heat-resistant and water- resistant identification means is provided on the product bearer, onto which a semi-plastic concrete panel is seated so as to be carried in a curing autoclave.

CONSTITUTION: A bearer 1 consists of a pair of main members 1a and seating members 1b, on which a panel is seated, and which are welded to the members 1a. At the predetermined site on the side of the main member 1a, a heat- resistant and water-resistant ceramic plate (or identification means), in which the identification number of the bearer 1 and a bar-code corresponding to the identification number are recorded, is fixed. On the other hand, in a controlling computer, dimensional specification, quality controlling conditions and the like are registered. By reading the information recorded in the identification means by every process and transferring them to the controlling computer, necessary processing conditions such as dimensional specifications, quality controlling conditions and the like registered in the computer can be recognized.