To avoid the trouble of simultaneous double purchase requests from a user on a network and a customer visiting a shop by immediately reporting merchandise desired to purchase from the user through the network is already reserved or sold to the customer visiting the shop or a clerk concerning such merchandise.

This system uses announce panels 12-14 for reporting displayed articles 2-4 are respectively on sale, already reserved or sold to customers (including the customer visiting the shop and the remote client user to perform on-line shopping through the network) and the clerk. The announce panel 12 is attached to the surface of merchandise 2 by a chain 12a or a strap, the announce panel 13 is attached in the hole of button at the hem part of merchandise 3 by the strap or the chain 13a, and the announce panel 14 is placed at a position near the merchandise 4 on a table 1. All the announce panels 12-14 can be visually watched in real time by images from a camera 51.