To facilitate grasp of a maintenance period of a plurality of parts and enhance operability of a device by a method wherein, in any or all of the plurality of parts, use conditions based on a use amount are displayed in a list in each of the respective parts.

For example, in an automatic variable containing device, whenever a microcomputer may issue a labeling instruction to a labeler, it renews a use amount and stores it. When being informed of a present use amount, a use condition list display screen is displayed on a touch screen 34 by a predetermined operation. A gross use period, a caution label and the like as well as a part name as a maintenance object are displayed on this display screen, and a ratio of the use amount (use condition) corresponding to each part in each of respective labelers is displayed by assorting by coloring in a bar graph so as to understand relation with the criterion of a maintenance period. Thus, as the use conditions and maintenance period can be expected, parts that need be exchanged can be beforehand prepared.