Problem: Performing picking work using (paper) instruction sheets results in human error. Time wasted looking at instruction sheets results in low work efficiency. Store pallet numbers, picking station numbers, and picking instructions (e.g., picking component numbers and picking quantities) to Data Carriers (ID Tags) mounted to the pallets. At each picking station, read the information from the Data Carrier, turn ON the lamp for the rack corresponding to the picking component number and, at the same time, display the picking quantity. The operator puts the displayed quantity of the displayed component in the pallet.