KR20030003138A - Method for auction which buyer and seller both can negotiate a bid price - Google Patents

Abstract

PURPOSE: An auction method is provided to automatically lower a sale price until a bid price is matched with the sale price and to automatically raise a bid price until the bid price satisfies a sale price. CONSTITUTION: The method comprises several steps. First, a seller registers data on an auction goods at a database, receives a corresponding auction number, and a web server publicizes the registered auction data(S110-S116). In a case that there has been no successful bid for a set time, the web server lowers the sale price by a set price width(S126). In a case that the seller requests an auction cancellation, the web server cancels an auction registration(S138). In a case that a buyer requests data on the auction goods, the web server transmits the list of the auction goods and relevant data to the buyer(S144). In a case that the buyer sends a bid price to the web server, the web server transmits the bid price to the seller and the buyer(S148). In a case that the seller accepts the transmitted bid price, the web server determines the buyer as a successful bidder, transmits the bid result to the seller and the buyer, and finishes the auction(S152). In a case that a buyer requests a purchase reservation registration, the web server transmits the reservation registration data to the seller and the buyer(S162). In a case that a seller selects an instant sale, the web server determines the seller as a successful bidder(S168, S152). In a case that a purchase price of the reservation registration data is higher than a registered hopeful sale price, the web server proceeds to a successful bidder determination step(S170). In a case that a purchase price of the reservation registration data is lower than a registered hopeful sale price, the web server automatically raises the purchase price by a set price raise width(S174).

Description

Two-way price auction {Method for auction which buyer and seller both can negotiate a bid price}

The present invention relates to an auction method through the Internet. More specifically, when a sales person inputs a type of item and price, a condition of sale, a change in price, a period of change in price, and a sale lower limit through the Internet, the auction server responds to the condition. Accordingly, the bidding price is automatically lowered to find the purchaser, and the purchaser's reservation register also makes the bidding price of the buyer's competitive auction price higher by automatically changing the bidding price. It is about a method.

In general, goods are traded using virtual spaces such as the Internet. Particularly, through auctions and reverse auctions, buyers can buy goods at lower prices, and sellers can sell goods at higher prices. To make it work.

Auctions are divided into British auctions and Dutch Auctions, depending on the type of item sold. Generally, auctions are widely used, starting from the lowest price of the item and gradually increasing the price. It is a way to determine the buyer as the buyer.

Dutch Auction starts with the highest price and gradually lowers the price. It is the way that the buyer who decides to purchase is determined as a buyer without setting a deadline.

Alternatively, there is a reverse auction method, which exists only online, in which a supplier who decides to offer the lowest price by the deadline when a purchaser of a membership or an article presents a purchase condition.

Here, the bidder of the British auction and the Dutch jade ship is the buyer, and the bidder of the reverse auction is the seller.

In a bid-to-price approach, the British auction fluctuates from a low to a high price, while the reverse auction and Dutch auctions start from a high price and fluctuate from a low price.

The auction end time is the British auction, the reverse auction is the auction end time pre-set by the auction client, while the Dutch auction is not determined according to the end time, the buyer's intention to buy means the end of the auction.

If the target of the auction is a commodity, the scope of comparison of the commodity is expanded so that it can be traded at a higher price to the person who needs it. Ensure that services are provided at a lower price.

For counterparties, they should be on equal positions. That is, in the case of British auctions and reverse auctions, the transaction will not be fair if the purchase or sale client presents an exorbitant minimum bid price.

Here, the minimum bid is a price not to be sold when the auction is closed at a price less than the price suggested by the seller at the time of auction request, which is the seller's authority. In addition, since the determination of the minimum bid is not disclosed to the counterparties, the efforts of all the bidders will be inconvenient if the price of the buyer who bids by the deadline falls below the minimum bid.

If the minimum bid is disclosed, the auction is not characteristic and becomes a general commerce method.

Dutch Auction does not require much effort from purchasers to purchase goods.

You just have to express your intention to buy. Even if the seller requested to sell, the auction is getting lower, so if there is no reason to proceed with the auction because there is no desire to purchase the auction, you can cancel the auction.

However, in the case of Dutch auction, time constraints follow. In other words, because the deadline is not fixed, you cannot enter the auction if you miss the time, and it is not developed into a transaction form where the buyer registers and purchases the product to be purchased. The limitations and one-sidedness of trading subjects have the problem of blocking the rapid development of e-commerce and limiting the opportunity to expand the user base.

The present invention is to solve the above-mentioned problems of the prior art, the purpose is to register the sales information of the goods to be auctioned by the seller through the Internet, the sales price according to the set time until the matched buyers It automatically registers the reduction, and the purchaser wishes to provide a two-way price auction method that can be registered to raise the desired price in accordance with the set price change time to reach a successful bid.

Another object of the present invention is to register the sales information of the item that the seller wishes to auction over the Internet, and automatically registers the sales price according to the set time until a matching purchaser is found, and the purchaser wishes to change Auction method that enables two-way price fluctuation so that bidders can be found in a more competitive position than other purchasers because they automatically register by adding a predetermined amount to other purchase reservation prices by searching for the reservation desired price.

1 is a block diagram of an auction system for implementing the present invention,

Figure 2 is a detailed block diagram of the auction server in Figure 1,

3 is a flowchart illustrating an auction process for bidirectional price change according to an embodiment of the present invention,

Figure 4 is a flow chart of a bi-directional price variable auction process according to another embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

111-115: Buyer's terminal 121-125: Seller's terminal

200: auction server 210: web server

220: database interlocking unit 221: register

222: certification unit 223: reception unit

224: process verification unit 225: price change unit

226: auction cancellation unit 231: user database

232: Auction Information Database

In order to achieve the object of the present invention, the bi-directional price-variable auction process according to the present invention uses a seller terminal connected to the Internet to receive an auction for a purchased item after user authentication, and auctions to bid on the auction using a buyer terminal. In the method, as the auction item information is input through the seller terminal, the auction number is assigned and registered in the auction information database, the sales information registration process for providing the auction information for the item on the Internet through a web server, If the auction item provided on the Internet through the web server is not successful for a predetermined time, the selling price is automatically lowered by the set price fluctuation width and registered in the auction information database, and the selling price automatically provided on the internet through the web server. Through the reduction process and the seller terminal In case of canceling the registered auction, the auction cancellation process for registering the auction cancellation for the auction item registered in the auction information database in the auction server, and the inquiry request through the seller terminal for the auction items provided on the Internet through the web server If there is an auction information providing process for transmitting the list of auction items and auction information to the seller terminal, and when the bidding bid is received for the auction items registered from the buyer terminal stores the bidding result data in the auction information database A bidding process for transmitting the bidding results to the buyer terminal and the seller terminal, and when the bidding of the buyer is made, the bidding is registered in the auction information database, and the bidding result is transmitted to the buyer and seller terminals. Successful bidding process and the auction information provided If the purchaser terminal receives the purchase reservation registration for the auction item through the process, a reservation registration process of storing the purchase reservation registration information of the auction item in the auction information database and transmitting the reservation registration result to the buyer and seller terminal; If an immediate sale is selected from the seller terminal receiving the reservation registration result through the reservation registration process, an immediate purchase process proceeds to the auction process, and a purchase reservation registration price stored in the auction information database in the reservation registration process and the auction information database. When the purchase reservation registration price is higher than the desired sale price, the price comparison process proceeds to the auction process, and the price fluctuation period when the purchase reservation registration price is lower than the desired sale price. Change in purchase price set according to Including the purchase price hike auto registration process automatically raise as much characterized by true.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention made as follows.

1 is a block diagram of an auction system for implementing the present invention, as shown here, a plurality of seller terminals connected to the Internet to input information such as goods or vouchers to be sold through an internet auction ( 121 to 125, purchaser terminals 111 to 115 for inputting a purchase price, etc. by a buyer who wants to purchase through an internet auction, and items or gift certificates requested for auction through the internet from the seller terminals 121 to 125. And auction server 200 for storing and selling the database of sales information such as the sales price, and storing and storing the information requested for purchase from the buyer terminals 121 to 125 in a database. .

FIG. 2 is a detailed block diagram of the auction server 200 in FIG. 1. As shown in FIG. 1, data is received from the purchaser terminals 111 to 115 and the seller terminals 121 to 125 through the Internet, and purchased. And a web server 210 providing sales information on the Internet in real time, a database interlocking unit 220 for inputting and outputting data into a corresponding database in response to a request of the web server 210, and the database interlocking unit 220. A registration unit 221 for performing user registration and update of registrant data for purchase and sale in the user database 231 and confirming and authenticating a user connected through user data stored in the user database (DB) 231. Under the control of the authentication unit 222 and the database interlocking unit 220, the sales information (desired selling price, price fluctuation period, desired price fluctuation range, etc.) of goods for sale by the seller and A reception unit 223 which registers purchase information (desired purchase price, price fluctuation period, desired price fluctuation range, etc.) of the goods for the auctioner in the auction information database (DB) 232, and the database linking unit 220 Process verification unit 244 for processing auction information for the auction item registered in the auction information database 232 and announce the web server and the seller / buyer through the database linking unit 220 The price change unit 225 for automatically raising the price as much as the price fluctuation set at the desired price change time and storing the price in the auction information database 232 and the database interworking unit 220 when the seller cancels the sale. The auction cancellation unit 226 registers cancellation information in the auction information database 232 received through the web server and deletes it from the auction list.

Referring to Figures 1 to 3 attached to the operation according to the embodiment of the present invention configured as described above in detail as follows.

First, in the present invention, when a seller of goods or membership, a service seller of a service business wants to sell through auction the sales conditions for a sales object to be sold through the Internet, the buyer wishes to purchase the auction server through the Internet. Search for a sales object and respond to the auction through a bid or reservation registration for the item you want to purchase. At this time, the desired selling price and the desired buying price are automatically lowered by the set width according to the set selling conditions, and the purchase price is automatically raised by the set width so that the auction is made.

1 and 2 is a block diagram of a bidirectional price variable auction system for implementing the present invention,

When the seller wants to sell the item that he wants to sell through the predetermined seller terminal 121 through the auction, the seller connects to the auction server 200 through the Internet (S102) (S104).

The seller terminal 121 logs in through the web server 210. In the case of a registered user, when authentication is requested to the authentication unit 222 through the database interworking unit 220, the database interworking unit 220 checks the ID and password for the corresponding user in the user database 231. Send to the web server 210 through.

If the user is not a registered user, the user information is input through the registration unit 221 to complete the user registration in the user database 231, and is authenticated to log in.

After completing the login, the seller terminal 121 registers the auction for the corresponding item through the reception unit 223 after inquiring the auction information. (S106) (S108).

The registration information for the sales item stores and stores the sales item information such as the model, state, quantity of the sales item, and the price information such as the desired selling price, expected cancellation price, desired price fluctuation period, and desired price fluctuation range. Here, the scheduled cancellation price, that is, the selling minimum price at which the seller does not sell below a predetermined price may be set or not set according to the seller's selection.

As such, when the input of the sale information from the seller terminal 121 is completed, the auction number is assigned and registered in the auction information database 232, and the information of the auction item is posted in real time through the web server 210. S114) (S116)

If the purchaser wants to purchase a purchase using the purchaser terminal 111, the purchase price is compared with the purchase price. (S120) (S122).

As a result of the comparison, if the purchase price of the purchaser is higher than the desired price of the sale, the bidding is proceeded, and if the price of the purchaser is low, it is determined whether the set price fluctuation time has been reached. (S124) (S126)

If the price that automatically cuts the selling price is the expected cancellation price or the seller cancels the auction, the auction is canceled. (S128) (S130).

However, before canceling the auction, the auction server 200 first searches whether there is a reservation registration of other buyers registered in the auction information database 232, and if there is no other buyer reservation registration, cancels the auction information in the auction information database 232. Register (S132) (S138)

If there are other purchase reservation registrants, it is determined whether the searched purchase reservation registrant's current purchase reservation price is lower than the expected cancellation price, but the upper purchase limit is higher than or equal to the current sales desire.

If the condition is satisfied, the auction server 200 automatically transmits a message asking the purchase registrant whether to purchase the product at the scheduled cancellation price.

If the above conditions are not satisfied or the purchase reservation registrant cancels the purchase, the auction is canceled.

When the purchase reservation registrant transmits a purchase intention, the successful bid is made at the scheduled cancellation price and the successful bid is made through the successful bidding process (S136).

When the purchaser wants to purchase the registered auction goods by accessing the auction server 200 through the Internet using the purchaser terminal 111, first, accesses the web server 210 of the auction server 200 and sells the goods list. If there is an item that you want to purchase from the list of purchases, check the detailed information such as the model, state, price of the corresponding item and then input the sales intention using the purchaser terminal 111 (S142). (S144)

If data is requested from the purchaser terminal 111 to request a bid at a price desired by the seller, the bidding result is stored in the auction information database 232 and then transmitted to the buyer and seller terminals 111 and 121. (S146-S150)

When the successful bid is made, the result of the successful bid is stored in the auction information database 232, and the successful bid is transmitted to the buyer and seller terminals 111 and 121. (S152 to S156)

When the purchaser terminal 111 accesses the auction server 200 through the Internet, the web server 210 provides a list of auction items registered in the auction information database 232 in real time.

When the purchaser wishes to register by using the purchaser terminal 111, a desired purchase price, a purchase upper limit price, a purchase price change period, and a price change width are set and input. (S162)

The purchase information transmitted through the purchaser terminal 111 is registered and stored in the auction information database 232. (S164)

The currently registered sales price is retrieved from the auction information database 232, and the seller selects an immediate sale, or if the current desired price of the registered reservation desired is higher than the desired sales price, proceeds to the successful bidding process (S152 to S156). (S168) (S170)

If the current purchase reservation price is lower than the desired price for sale, it waits until the price fluctuation time, and when the price fluctuation time comes, it automatically raises the desired purchase price fluctuation range and registers it in the auction information database 232 (S172). (S174)

If the purchase price automatically increased is the purchase upper limit set at the time of purchase reservation registration, the purchase upper limit is fixed to the purchase desired price and waits until the desired sale price decreases (S176) (S178).

If the desired purchase price is fixed at the purchase upper limit, the process returns to step S166 of detecting a change in the currently registered selling price every predetermined period.

As described above, the auction server 200 gradually decreases the auction price between the initial desired selling price and the expected cancellation price as set by the purchaser, and the desired purchase price between the initial purchase desired price and the purchase upper limit set and set by the purchaser. Gradually raise the price so that the auction can be viewed.

In the auction process for bi-directional price change according to another embodiment of the present invention, in the auction method for accepting a purchased item after a user authentication using a seller terminal connected to the Internet, and bidding the auction using a buyer terminal, As the auction item information is input through the seller terminal, a corresponding auction number is assigned, the auction information database is registered, and a sales information registration process of providing auction information about the item on the Internet through a web server, and the web server If the auction item provided on the Internet is not successful for a predetermined time, the selling price is automatically lowered by the set price fluctuation width and registered in the auction information database and the selling price automatic reduction process provided on the Internet through the web server, Auction registered by the seller terminal In the case of cancellation, the auction cancellation process of registering the auction cancellation for the auction item registered in the auction information database in the auction server, and if there is a request for inquiry through the terminal of the auction item provided on the internet through the web server, the auction The auction information providing process of transmitting a list of goods and auction information to the purchaser terminal, and when the bidding intention is received from the purchaser terminal for the registered auction item, the bidding result data is stored in the auction information database, and the buyer The bidding process of transmitting the bidding results to the terminal and the seller terminal, and if the bidding of the buyer is made, the bidding is registered, the bidding result is registered in the auction information database, the bidding result is sent to the buyer and the seller terminal and the auction ends. Through the auction process and the auction information providing process When the purchase reservation registration information is set for the auction item from the buyer terminal, the purchase reservation registration process of storing the purchase reservation registration information of the auction item in the auction information database and transmitting the result of the reservation registration to the buyer and the seller terminal; After the purchase reservation is registered, the currently registered sale price is detected and is higher than the currently registered desired purchase price or when the seller applies for the sale immediately, the second successful bidding process proceeds to the successful bidding process, and the search cycle set after the purchase reservation is registered. Another purchase reservation price comparison process that compares prices after searching other currently registered reservation prices, and as a result of the purchase reservation registration price comparison result, if the currently registered purchase reservation price is lower than another purchase reservation price Automatic increase of purchase price after returning to the purchase reservation registration process Characterized by including the process.

Figure 4 is a flow chart of a bidirectional price variable auction process according to another embodiment of the present invention, wherein the automatic selling price reduction process and the bidding process of the buyer set by the seller terminal 121 is the same as the preferred embodiment of FIG. Therefore, the same reference numerals are attached and detailed descriptions refer to preferred embodiments.

As shown in the drawing, the purchaser wishes to access the auction server 200 through the Internet using the purchaser terminal 111 to check the list of auction items provided by the web server 210 and to purchase the auction item to be purchased. Reservation is made. (S170)

Purchase reservation registration is auction by setting the information for the purchase reservation entered through the purchaser terminal 111, that is, the initial purchase price bid (A), the upper limit purchase price (B), the automatic change range (C) and the reservation status search period It registers in the information database 232 (S172).

Here, the automatic increase fluctuation range (C) is set to the minimum fluctuation range set by the seller, or, if there is no minimum fluctuation range, to be set at an appropriate price by comparing the selling price of the article.

The auction server 200 sets the purchase initial bid price A as the current desired purchase price X in the set purchase reservation information. (S174) The auction information database 232 sets the current desired purchase price X as A. Make a reservation at (S176).

The currently registered desired selling price is detected from the auction information database 232 and compared with the current desired buying price (X). If the current desired buying price is higher than the current desired selling price, the successful bidding process (S156 to S160) is performed. S178) (S180)

In addition, if the seller wants to sell immediately at the registered current desired purchase price (X), the process proceeds to the successful bidding process (S156 to S160).

When the auction server 200 does not win the registered current desired purchase price (X), the auction server 200 searches whether there is another purchase reservation registrant according to a preset search period. (S184) (S186).

If there are other purchase reservation registrants, the current reservation reservation price is compared with another search reservation registration price (D) found. (S188) (S190) As a result of the comparison, the other purchase reservation registration price (D) found is greater than the current reservation registration price. When high (X = <D), the auto-raised price (D + C) is set to the current desired purchase price (X = D + C) by the auto-changing change range (C) set by the buyer. (S192) (S194)

For example, if the current price of the purchaser has been reserved for 10,000 won, the purchaser of another buyer has registered for this 10,000 won, the auction server 200 searches for other purchaser even if there is no request from the purchaser. The reservation registered price is automatically set to the current desired purchase price by adding 20,000 won, which is the 10,000 won plus the preset 1,000 won by the current purchaser.

Returning to the step (S176) of pre-registering the desired purchase price (D + C) automatically set by the auction server 200 to the auction information database (232), and repeating the above steps (S176 to S196) until the successful bid Done.

If the set current desired purchase price that is automatically raised in this way is greater than or equal to the purchase upper limit compared to the set upper limit purchase price (B), the upper limit purchase price (B) is fixed to the current desired purchase price (X = B). The process returns to the step of registering in the auction information database 232 (S196) (S198).

As described above, the seller who wants to sell the goods through the internet auction sets the initial desired sales price and the expected cancellation price using the seller terminal 121, and drops the selling price by the set price fluctuation until the scheduled cancellation price is reached at each set time. On the other hand, the purchaser wishes to re-register by adding the predetermined amount set to the reservation registration price of the other purchase reservation registrant, starting from the initial purchase desired price using the purchaser terminal 111, when another purchase reservation registrant is searched. Auctions will be held in a location that is advantageous in contention with other reservation registrants.

While the embodiments of the present invention have been described above, modifications may be made in various forms, and one of ordinary skill in the art may make various modifications and modifications without departing from the scope of the claims of the present invention. It is understood that it can be done.

As described above, in the bidirectional price variable auction method according to the present invention, when a sales prospective enters the type and price of a sale item, a sale condition, a price change range, a price change period, and the like, the auction server according to the condition The effect is to automatically find the desired buyer by gradually lowering the desired selling price.

Since the purchaser wishes to register by raising the desired purchase price according to the set price fluctuation time, the purchaser has the effect of eliminating the time and space inconvenience that the purchaser must frequently search for the auction price of the item to be purchased at the auction. .

In addition, the purchaser can search for the desired purchase price of other purchasers at predetermined intervals and automatically register the purchase price by adding a predetermined amount to the purchase price of the other buyers. It works.

Claims (12)

In the auction method using the seller terminal connected to the Internet after receiving the user authentication in the auction for the purchased goods, and bidding the auction using the buyer terminal, A sales information registration process of assigning auction number as the auction item information is input through the seller terminal, registering the auction number in the auction information database, and providing auction information about the item on the Internet through a web server; If the auction item provided on the Internet through the web server is not successful for a predetermined time, the selling price is automatically lowered by the set price fluctuation width and registered in the auction information database, and the selling price automatically provided on the internet through the web server. Reduction process; An auction cancellation process of registering an auction cancellation for the auction item registered in the auction information database in the auction server when the auction registered by the seller terminal is canceled; An auction information providing process of transmitting a list of auction items and auction information to the purchaser terminal when an inquiry request is made through the purchaser terminal for an auction item provided on the Internet through the web server; A bidding process of storing the bidding result data in the auction information database and transmitting the bidding result to the buyer terminal and the seller terminal when the purchase bid doctor receives the registered auction item from the buyer terminal; A successful bidding process if the bidding is made by the buyer, registering the successful bidding result in the auction information database, transmitting the successful bidding result to the buyer and seller terminals and ending the auction; When the purchase reservation registration is received for the auction item by the buyer terminal through the auction information providing process, the purchase reservation registration information of the auction item is stored in the auction information database, and the reservation registration result is transmitted to the buyer and seller terminal. Reservation registration process; An immediate purchase process that proceeds to the auction process when an immediate sale is selected from a seller terminal receiving the reservation registration result through the reservation registration process; As a result of comparing the purchase reservation registration price stored in the auction information database and the current sales desired price registered in the auction information database in the reservation registration process, if the purchase reservation registration price is higher than the desired sales price, the price comparison proceeds to the successful bidding process. process; And When the purchase reservation registration price is lower than the desired price for sale, the auction method for bi-directional price fluctuation, characterized in that it comprises a purchase price automatic increase process for automatically increasing the registered price increase according to the purchase desired price set in accordance with the price fluctuation period. The method of claim 1, The auction information set in the sale information registration process is a bi-directional price change auction method characterized in that the made including the desired selling price, selling price fluctuation period, the selling price fluctuation range and the expected cancellation price. The method of claim 2, wherein the scheduled cancellation rate is set according to a seller's choice. The method according to claim 1 or 2, Searching for another buyer's reservation registration if the desired selling price automatically lowered in addition to the selling price automatic reduction process is less than or equal to the cancellation expected price set by the seller, or the seller requests to cancel the auction; Transmitting data to the other purchase reservation registrant asking for a purchase intention to be canceled if the other purchase reservation registration price is within the expected cancellation price range as a result of the search; And And if the purchaser agrees to purchase at the expected cancellation price, further comprising bidding at the expected cancellation price. The method of claim 1, In the reservation registration process, the reservation registration information is the auction method for bi-directional price fluctuation, characterized in that the desired purchase price and purchase upper limit, the purchase price fluctuation period, the price fluctuation width data transmitted through the buyer terminal. The method of claim 1, The automatic purchase price increase process may include: automatically registering an increase as much as the desired purchase price change range when the price change time registered in the auction information database arrives; If the purchase price of the automatic increase registered is lower than the set purchase limit, detecting the sale price currently registered in the auction information database and returning to a price comparison process comparing the purchase price with the purchase price; And If the desired purchase price is automatically higher than the set purchase price, the purchase price is fixed to the purchase price until the sale price is higher than or equal to the reservation price through the automatic auction price reduction process. Bi-directional price variable auction method comprising the step of waiting. In the auction method using the seller terminal connected to the Internet after receiving the user authentication in the auction for the purchased goods, and bidding the auction using the buyer terminal, A sales information registration process of assigning auction number as the auction item information is input through the seller terminal, registering the auction number in the auction information database, and providing auction information about the item on the Internet through a web server; If the auction item provided on the Internet through the web server is not successful for a predetermined time, the selling price is automatically lowered by the set price fluctuation width and registered in the auction information database, and the selling price automatically provided on the internet through the web server. Reduction process; An auction cancellation process of registering an auction cancellation for the auction item registered in the auction information database in the auction server when the auction registered by the seller terminal is canceled; An auction information providing process of transmitting a list of auction items and auction information to the seller terminal when an inquiry request is made through the seller terminal for an auction item provided on the Internet through the web server; A bidding process of storing the bidding result data in the auction information database and transmitting the bidding result to the buyer terminal and the seller terminal when a purchase bid doctor receives a registered auction item from the buyer terminal; A successful bidding process if the bidding is made by the buyer, registering the successful bidding result in the auction information database, transmitting the successful bidding result to the buyer and seller terminals and ending the auction; If the purchase reservation registration information is set for the auction item from the buyer terminal through the auction information providing process, the purchase reservation registration information of the auction item is stored in the auction information database, and the reservation registration result is transmitted to the buyer and seller terminal. Purchase reservation registration process; A second successful bidding process which detects a currently registered selling price after registering the purchase reservation and proceeds to the successful bidding process if the seller's request is higher than the currently registered desired purchase price or the seller immediately applies for selling; Another purchase reservation registration price comparison process of comparing a price after searching for another purchase reservation registration price currently registered when the search period is set after the purchase reservation registration; As a result of the purchase reservation registration price comparison, if the currently registered purchase reservation price is lower than another purchase reservation price, the purchase price is automatically increased by a predetermined amount and then returns to the current purchase price reservation registration process. Two-way price auction method characterized in that. The method of claim 7, wherein The auction information set in the sale information registration process is a bi-directional price variable auction method characterized in that the made including the desired selling price, selling price fluctuation period, selling price fluctuation range and the expected cancellation price. 9. The method of claim 8, wherein the scheduled cancellation rate is set according to a seller's choice. The method according to claim 7 or 8, Searching for another buyer's reservation registration when the desired sales price automatically lowered in addition to the selling price automatic reduction process is equal to or less than the expected cancellation price set by the seller or when the seller requests to cancel the auction; Transmitting data to the other purchase reservation registrant asking for a purchase intention to be canceled if the other purchase reservation registration price is within the expected cancellation price range as a result of the search; And And if the purchaser agrees to purchase at the expected cancellation price, further comprising bidding at the expected cancellation price. The method of claim 7, wherein The purchase reservation registration information is an auction method for bidirectional price fluctuation, characterized in that the initial purchase price, including the purchase price, the maximum purchase price, automatic change fluctuation range and other search reservation status. The method of claim 7, wherein Comparing the automatically increased desired purchase price with a preset purchase upper limit price in addition to the automatic purchase price increase process; And And if the increased desired purchase price is higher than the purchase upper limit as a result of the price comparison, fixing the purchase upper limit to the current desired purchase price and returning to the purchase reservation registration process.