To prevent dead stock and to allow a person having a time affordable for travel by chance to purchase a travel item just before a utilization date.

On a selection screen G1 provided via a public network 20 by means of a computer system of a service provider, travel items with the fixed utilization date of a plurality of travel agencies are displayed with the agency names hidden. When a buyer making access to the selection screen G1 via the public network 20 by means of a computer system 30B of the buyer finds a desired travel item and clicks a pointer matched on an application form, the travel item is sold to the buyer. The sales price is lowered as a departure date of the travel comes closer.