To enhance customer's purchasing will by making the customer to freely listen or view the contents of a merchadise before purchase, to increase the amount of sales of a sales store, to reduce the workload of employees of the store or to reduce the number of employees, to reduce a large amount of merchandises being stored and to increase the profit of the store.

A customer is able to tentatively listen to or review an arbitrary merchandise he or she wishes to purchase by using a system composed of a large capacity storage device 1 that beforehand stores music and video data of the merchandise on which music and video are recorded, a server 2 which controls the device 1 and trial terminal devices 7 that are connected to the server 2 through a network 6, and the customer freely listens or observes an arbitrary merchandise which he or she is planning to purchase.