| 摘要 |
PURPOSE: A business method is provided to give profit to a seller and purchaser by purchasing and selling used equipment at a suitable cost in seller and purchaser view points. CONSTITUTION: An internet center includes a special database server computer and a fire wall. A database center classifies equipment of respective independent area by kinds. The database center analyzes a tested market price to determined a basic cost rate in order to determine a cost rate according to a usage period and a market circumstance. A data transmitting center transmits data at real time by an investigator which investigates a market cost in an offline. A network of a data support center analyzes the data from the data transmitting center to upgrade a cost variable. An equipment master can recognizes a reference cost of used equipment which the equipment master has.
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