PURPOSE: To enable participation even without the actual article in an inside auction and to automatically display the state explanation of the presented article.
CONSTITUTION: Before starting the auction, a state explanation diagram is stored in a first disk 22, and the photograph of the presented article is stored in second and third disks 24 and 26. In the case of the auction, a signal comes from an auction machine 1, first-third personal computers 21, 23 and 25 are operated and the stored state explanation diagram and photograph are transmitted to a switcher 32. Simultaneously, a fourth personal computer 31 receiving the signal of the auction machine 1 operates the swicher 32, and a picture display device 4 displays the state explanation diagram and the photograph at the decided time in the decided order. Thus, users can be participated in the auction even without carrying the presented articles into the site of the auction.