Next, a method of registering the alternative component will be described with reference to FIG. 5. The process, to be described below, is performed after the operator switches the function of the component arranging operation supporting apparatus 4 from the component comparing process to the alternative component registering process. First, the component arranging operation supporting apparatus 4 acquires the component IDs from the supply reels 14A and 14B (ST11: identification information acquiring process). That is, the barcode reader 25 reads the component ID of the master component from the barcode label 16 of the supply reel 14A that has already been set to the tape feeder 13 (arrow d). Similarly, the barcode reader 25 reads a component ID of an alternative component which has not been registered from the barcode label 16 of the supply reel 14B (arrow e). The two read component IDs are transmitted to the control unit 24. That is, in this process (ST11), the identification information related to the component (master component) and the identification information related to the alternative component that can be used as an alternative to the corresponding component are acquired by the identification information acquiring unit.