To accurately sort articles without interfering with already placed articles by placing the articles on a carrier conveyor after investigating a memory area for renewing/writing-in ancillary information on a belt address of a conveyor belt passing through a placing position.

Molding (articles) 45 to 47 molded by shell molding work machines 41 to 43 are taken out by automatic taking-out machines 44A to 44C to be delivered to a carrier conveyor 60. In this case, an absolute address corresponding in (1:1) to a belt address for partitioning a position on a conveyor belt 61 and a memory area with every absolute address are arranged in a controller 90. When placing the articles on the carrier conveyor 60, ancillary information on the belt address of the articles is written in the memory area of the corresponding absolute address, a memory of the memory area of the absolute address is read out in a placing position of the articles to judge the possibility of placing the articles, and then, a classification of the articles is judged to indicate sorting to a sorting conveyor 71.