| 摘要 |
PROBLEM TO BE SOLVED: To provide a customer service that can keep the motivation for participation.SOLUTION: In a digital signage device 1, a control unit 23 puts pieces of a puzzle displayed on an image forming unit in any of positions where pieces are not put, and when an answer to a pattern of the puzzle is input through an operation unit 32, gives a coupon to a person who has tried to solve the puzzle on the basis of the input answer. |
