After the resale registering of the betting ticket, through server device 3, with circumstance before the race/lace and in race/lace, the betting ticket which the resale register has done is indicated in the terminal unit 2 of each user. Each user, while checking the circumstance of race/lace, decides the purchase desired amount of the betting ticket which this resale register has done, transmits to server device 3. Server device 3 calculates resale price in real time on the basis of with the probable dividend of that betting ticket which is announced from horse racing sponsor side and the purchase desired amount from each user, transmits to the terminal unit 2 of each user. Resale price fluctuates in real time according to race/lace advance, the user transmits, while this looking at the resale price which fluctuates, deciding the purchase desired amount. Server device 3, when race/lace ends, ends the reception of the above-mentioned purchase desired amount, notifies the resale price and the like which finally was calculated vis-a-vis each user which it resells and purchases that betting ticket and. Because of this, the auction system of the betting ticket which is purchased legitimately from horse racing sponsor side is offered.
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