To provide a medical cost adjusting method for suppressing a medical cost to a reasonable price so that a person who suffers from a disease can receive an appropriate medical service even if the person is not insured. A medical institution presents a predicted medical cost to be demanded therefrom for a medical service given to a patient as a desired demanding amount and, on the other hand, the patient, who desires to receive the medical service, presents a payable medical cost as a desired medical treatment amount, thus, matching of the desired demanding amount to the desired medical treatment amount is carried out. Accordingly, it is possible of integrating a reverse auction and a regular auction making it possible of efficiently collect members concerned in the auction trade. In the reverse auction, a medical cost is used as an article of trade between a medical institution and a patient. That is, the integrated auction according to the present invention is an auction structure between members wherein a demand for an article of trade is attempted to meet a supply of the same, and this brings about a condition where there is a high possibility of making a successful bid and an effect of markedly reducing a medical cost as compared to a conventional medical cost.
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