KR20010055490A - Method for producing an estimate using database - Google Patents

Abstract

PURPOSE: A method for calculating an estimation using a database is provided to update registered seller information and registered buyer information in accordance with a database, and to perform an ordering application of a buyer at need by registering only certified sellers and making the database storing the registered seller information and the registered buyer information. CONSTITUTION: A client(21) is connected to the Internet, and a general buyer may search and buy a commodity by connecting to a virtual store. A web server(22) comprises a server program(23), an order processing program(24) and a database server(25), and a web server program must be installed and executed in the web server(22). The server program(23) is connected to the client(21) through the Internet. The server program(23) is installed and executed for processing a URL-formed information searching request transmitted from the client(21). The order processing program(24) is connected to the server program(23) and supports a server-client interactive operation for processing a buy's information demand. As the order processing program(24), the CGI or ASP is generally used. The database server(25) is connected to the order processing program(24) and stores seller information and buyer information and interworks to the order processing program(24) for updating the seller information and buyer information or a database update as recording transaction contents on a financial statements.

Description

Estimation method using a database {METHOD FOR PRODUCING AN ESTIMATE USING DATABASE}

The present invention relates to a method for calculating a quote using a database, and more particularly, a buyer intends to purchase a product according to a buyer's taste and presented amount by making a database of sellers' products, sales capacities, and personal information in an internet-based electronic commerce. It's about how to get a good estimate for a product.

In general, electronic commerce refers to commerce using an information and communication network such as the Internet, and electronic commerce may be classified into electronic commerce between organizations (corporate and government) and electronic commerce between companies and consumers according to related entities. EDI (Electronic Data Interchange) is mainly used for inter-organizational commerce, and industry at the Light Speed (CALS) is expanded to electronic commerce, which is the concept of inter-organizational transaction, as the system is completed. E-commerce between companies and consumers is being implemented based on web-based advertising, virtual shops, and electronic payments with the activation of the global network, the Internet-based EC. Therefore, e-commerce is a broad concept that includes not only daily transactions involving flow of funds, but also marketing, advertising, logistics, and services.

Since the Internet can be accessed at any time anywhere in the world, marketing activities using the Internet have no spatial and time constraints, and interactive communication is possible because they can receive direct responses from consumers. In addition, since people who enter the Internet site can be classified into several characteristics according to the characteristics of the site, companies can target marketing to the target group, and consumers' e-mail address and their direct response are interactive. Because it can collect, it provides the advantage of one-to-one marketing. This is difficult to achieve in marketing using mass media. In general marketing activities of the industrial society, it is necessary to pay a very large amount of money and time to select and target the target group. There is an advantage that it can.

A schematic block diagram illustrating the concept of a general Internet-based e-commerce is shown in FIG. 1, and as shown in FIG. 1, a general Internet-based e-commerce includes products such as a purchaser who wants to purchase a product, a product list, and a product price. Consists of a seller selling products and a product sales site that contains all the relevant information and is configured to facilitate the entire process of electronic commerce.

First, buyers and sellers register on the Internet, and entrepreneurs or sellers who operate product sales sites (if the sellers operate their own product sales sites) need to know all information about sellers who want to sell their products: Register sales volume, payment method, and personal information on the product sales site.

When a buyer visits a product sales site to purchase a product, the product sales site sends a front office to the buyer. Here, the buyer must enter a Uniform Resource Locator (URL) of a web browser to visit the front office of the product sales site. The front office is the first place to connect when you use your own web-based tools, which are now translated as "Internet addresses on the web." Since the front office is composed of hypertext, you can click on the link point on the screen to jump to the corresponding page or to another server. One of the strengths of the Web is that even individuals can provide some information to the world. The source of this information is called the front office. To create a front office, you need to have a web server installed on your host. The front office is written in a computer language called "HyperText Markup Language" (HTML). After you create a front office, you need to register it on the Internet. To register a front office on the Internet, a service provider registers a web server or registers it with an Internet service provider (ISP). The front office registration means includes a method of using WS-FTP, a method of registering at an ISP front office, and a method of using a PC communication program. Front office registration methods and methods vary depending on the ISP. WS-FTP is a program developed by IPSWITCH, which has a lite version and a pro version. The pro version has a succession function, but can be used for only 30 days, and the lite version has no inheritance function. It is available.

When the product sales site enters a URL, it checks the buyer's address and sends the front office to the buyer's browser. When a purchaser orders a product to purchase based on the transmitted front office, the product sales site analyzes the data on the order application and processes the order. The order processing result is sent to the buyer and seller by the product sales site.

However, in order to purchase a desired product, such a general internet-based e-commerce should visit a site selling the product one by one and purchase the desired product. Since all the necessary products can be purchased, there is a problem that the corresponding product cannot be purchased if the site for some of the entire items to be purchased is not known.

In addition, when the buyer wants to purchase the product at the lowest price or to purchase a product corresponding to the amount of money the buyer has, the visitor has to visit several sites and compare them with each other. Due to the lack of information of the buyer, there are various problems such as visiting defective sites and purchasing defective products or paying money but not receiving products.

In addition, the conventional estimation method has to know all the product information, if you do not know some product information or want to re-evaluate some of the products, there is a problem that must be implemented again from the beginning.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is to secure the seller information registered only the verified seller, the registered seller information and buyer information to the database to the need Accordingly, the present invention provides a method for calculating a quotation using a database that updates each piece of information in connection with such a database and can process an application for a purchaser's order.

Another object of the present invention is to divide the product to be sold into a product (for example, coma) to produce a single product group by combining multiple products to produce a single product by combining several parts (such as a computer) The purpose of the present invention is to provide a method of estimating a database using a database that displays a list of products in accordance with a buyer's taste or a suggested amount of several products that a buyer needs.

Still another object of the present invention is to provide a method of calculating a quotation using a database, which helps a buyer to purchase several products in a batch, thereby saving time and reducing the effort of the buyer.

1 is a schematic block diagram illustrating the concept of a general Internet-based e-commerce.

2 is a block diagram showing the overall flow of the method for calculating the quotation according to the present invention.

3a to 3l are exemplary views showing the progress of the quotation calculation method according to the present invention.

4A and 4B are flowcharts illustrating an order receiving process and an order processing process of a method for calculating a quote according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

21: Client 22: Web Server

23: server program 24: order processing program

25: database server

According to the present invention for achieving the above object, the operator of the virtual store stores the seller information in a database, and when the buyer enters the address of the virtual store, the web server of the virtual store checks the buyer's address and sends the front office to the buyer's browser. In the method of calculating a quotation using a database for sending a product to be purchased by the buyer when the buyer requests an order, and the buyer determines whether to purchase the transmitted product, according to the product to be purchased by the buyer A first output step of outputting a condition for the basic quotation for identifying the taste of the buyer; and a combination of products suitable for the taste of the buyer by searching the database when the buyer inputs the condition for the basic quotation according to the first output step. And a second output step of outputting a product list to the product list of the second output step. If the buyer selects the desired product according to the detailed information about the selected product to determine whether or not satisfied with the selected product; and if the buyer is satisfied with the selected product in the judgment step, enter the intention to purchase a purchase, the buyer selected Inputting a purchase intention after changing to a desired product if not satisfied with the product; And the operator of the virtual store transmitting the order processing result to the buyer and the seller when the buyer inputs a purchase application intention in the input step.

Hereinafter, a preferred embodiment of a method for calculating a quote using a database according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram showing the overall flow of the method of calculating the quotation according to the present invention, the present invention is largely composed of a client 21 and a web server (22). The client 21 refers to a computer used by a general consumer visiting a virtual store and a web browser such as Netscape or Internet Explorer installed on the computer. A typical buyer uses a web browser to visit a virtual store, select a product, place an order, confirm an order, and receive other customer service. That is, the client 21 is a computer connected to the Internet and installed with a web browser, and means a computer system in which a general purchaser can search for or purchase a product by accessing a virtual store.

The web server 22 is composed of a server program 23, an order processing program 24 and a database server 25, the web server 22 is connected to the Internet, the server name (for example, www.netsell .com) is registered in the domain name server, and the web server program is a server hardware that allows general Internet users to search for information in the URL format (for example, http://www.netsell.co.kr). This must be installed and run.

The server program 23 is connected to the client 21 via the Internet, and is a program that is installed and executed to process information retrieval requests in the form of URLs transmitted from the client 21. The server program 23 includes NCSA, CERN, Apache, JIGSAW, a server for Unix, IIS, a server for Windows NT, and WebSite, a server for both Windows NT and Windows 95/98.

The order processing program 24 is interconnected with the server program 23, and is a program that supports server-client interaction to process a buyer's information request (for example, order processing). It uses a standardized way of communicating information, called the Common Gateway Interface (ASP) or Active Sever Page (ASP). In the present invention, CGI and ASP are used. The information transmitted to the web server 22 in accordance with the CGI and ASP formats is processed by the CGI and ASP programs 24 installed in the web server 22 in accordance with the CGI and ASP standard formats. In the case of a virtual shop, when a buyer orders an item, the order information arrives at the web server 22 according to the CGI and ASP formats. Then, the CGI and ASP program (that is, the order processing program 24) implemented for the order processing interprets the order information according to the CGI and ASP format to identify the contents of the product that the buyer wants to purchase and confirm the seller information. Order processing such as sending an order processing result.

The database server 25 is interconnected with the order processing program 24 and stores buyer information and seller information (handling products, sales capacity and personal information), and updates buyer information and seller information or trades in financial statements. It operates in conjunction with the order processing program 24 for updating the database such as recording the contents.

The overall operation of the method for calculating the quotation using the database according to the present invention as described above will be described with reference to FIG.

The buyer first visits the front office of the virtual store to purchase the product. At this time, if the buyer enters the URL of the desired virtual store in the URL input box of the web browser in the client 21, the URL is transmitted to the server 22 of the virtual store. The server 22 of the virtual store receives the transmitted URL and transmits the front office to the browser of the client 21. The front office transmitted to the client 21 is transmitted in the form of an HTML document and displayed on the web browser by the client 21. In general, in order to implement the front office transmitted from the web server 22, whether there is an order from any buyer, and the order reception process, HTML forms, CGI, ASP, and the like are required. In the HTML document, an HTML form is provided to send various data input by the buyer to the server so that the buyer and the web server 22 of the virtual store can interact with each other. That is, when a buyer inputs data such as a string or an option into an HTML form, which is a kind of HTML document, and clicks the 'send' button, the input data is transmitted to the operator's server. In addition, the data exchange standard rules of CGI and ASP programs are used to exchange information between the client 21 and the web server 22 or between the server program 23 and the order processing program 24. The server program 23 should support server-client interaction in order to process the user's information request (e.g., purchase product order processing). For this purpose, the server program generally communicates standardized information such as CGI and ASP. Support the method.

When a buyer visits the front office, searches for various products displayed on the front office, selects a product to purchase, and performs a general order acceptance process, the contents are transmitted to the web server 22 of the virtual store. The web server 22 receives the order contents and inputs the received contents into the order processing program 24. At this time, the order content is input from the client 21 in HTML form, the input data is expressed in a standardized method such as CGI and ASP is transmitted to the web server 22, the transmitted data is sent to the order processing program 24 It is input and processed. A detailed description of the order acceptance process transmitted from the client 21 to the web server 22 will be described later with reference to FIGS. 3A to 3L and 4A and 4B.

When the order contents received in the virtual shop are input to the order processing program 24, an order processing program 24 called CGI and ASP programs is driven to perform the order processing process such as checking the order contents and outputting a quotation. do. The order processing program 24 should be implemented appropriately for the characteristics of the virtual shop and the order processing method by using a programming language such as C, Java, or Perl at the option of the operator of the virtual shop. And a database for updating the seller information, adjusting the inventory of the products sold, or recording the transaction in the financial statements, in conjunction with the order processing program 24.

When the order processing program 24 completes the order processing process and updates the database accordingly, the processing result is transmitted to the buyer and the seller so that the buyer and the seller can check the order processing result. At this time, the order processing program 24 writes the result of the order processing in the form of an HTML document so that the buyer and seller can check using a web browser and transmits to the client of the buyer and seller.

3A to 3L are exemplary views illustrating a process of estimating method according to the present invention.

3A is a quotation site page showing a front office transmitted from a server of a virtual store, a banner including a welcome message and titles of main products are displayed in the center of the screen, and details of the main products are displayed on the right side of the screen. On the left side of the screen is a menu table consisting of site introduction, user guide, shopping cart, new product introduction and bulletin board. 'Site Introduction' in the menu table is a menu that shows a general introduction of the site (quote site) on the screen, 'User Guide' is a menu that explains how to carry out the quotation site, and 'Shopping cart' is a purchased product. 'New Product Introduction' is a menu that displays products, product descriptions, advertisements, and prices of new products offered on this site. This menu is available. If a buyer wants to purchase a variety of products related to a computer, he or she can click on a computer among the main products in the center of the screen.

3B is an order history page that appears when a user clicks the computer in FIG. 3A. A text describing the description and the process of the order history page is displayed at the center of the screen, and at the bottom of the screen is an 'access' key for proceeding to the next step. There is a 'Member ID' field for entering a member ID and a 'Cancel' key to cancel the current step and proceed to the previous step. Here, the first visitor to the quoted site of the present invention does not have a member ID, so the 'member ID' field is not required.

3C is a buyer preference page for selecting various parts of a computer according to a buyer's preference, and a 'parts list (that is, a CPU, a memory, a board, a VGA, and a monitor) in which a plurality of parts handled in a virtual store are displayed at the center of the screen. Etc. 'and' Parts selection box 'that selects the part that the buyer wants to buy, and the' Amount presented 'field is entered at the bottom of the screen to enter the desired price for the parts that the buyer wants to buy. There is a 'setting' key to check the entered data and proceed to the next step and a 'cancel' key to cancel the current step and proceed to the previous step. Here, the 'parts list' may change depending on the product possessed by the operator of the virtual store. When the buyer wants to select all the 'parts list' displayed on the buyer's preference page, he clicks on all the 'parts' box. At this time, when the 'part selection box' is clicked, the 'part selection box' is displayed (▣), and the displayed 'part list' becomes dark and selectable. If you double-click the 'part list' turned to dark color, a sub-screen is displayed asking the buyer's taste about the part. For example, when all the 'part selection boxes' are selected, double-clicking 'CPU' in the 'part list' displays a sub-screen as shown in FIG. 3D. The sub-screen displays the items for selecting the buyer's desire for 'CPU speed', and the 'setting' key for setting the selected items and the 'cancel' key for canceling the current step and proceeding to the previous step. do. If the buyer wants a 'fast speed' CPU, click the mark (◎) located to the left of the 'fast speed' item with the mouse and the mark (◎) will change to the mark (⊙), and then click the 'setting' key. do. Clicking the 'Settings' key on the subscreen (FIG. 3D) returns to FIG. 3C and the buyer's preferences for the remaining lists ('Memory', 'Board', 'VGA', 'Monitor') in the 'Part List' It is the same as the method of selecting the buyer taste by clicking 'CPU', and an exemplary view of the sub-screen for the list is shown in FIGS. 3E to 3H. Here, the items asking the taste of the buyer can be freely set by the operator of the virtual store.

FIG. 3i is a product list page which outputs title lists corresponding to a buyer's taste and a suggested amount. In FIG. 3c, when a buyer enters a part or a presented amount according to his / her taste and clicks the 'setting' key, the buyer's taste Alternatively, the product list corresponding to the presented amount, the 'product check box' for selecting the product list, the 'setting' key for setting the selected item and the 'cancel' key for canceling the current step and proceeding to the previous step are displayed. . At this time, in order to select a product list to be purchased by the buyer, the displayed product list is carefully examined, and the mark (?) Located to the left of the product list is changed to the mark (▣), and then the 'setting' key is clicked.

FIG. 3J is an order request page that displays detailed information on desired products to be purchased when the first product list of FIG. 3I is selected, and a picture of each product is displayed at the top of the screen, and a purchaser selects the center of the screen. On the right side of each product list is a 'Detail' key where you can search for detailed information about the price and specification of the product and the price and specification of other products if you change the product. On the left side of the product list, there is a 'Total Amount' column that shows the price of the purchased products.At the bottom of the screen, a 'confirmation' key is used to finally confirm the products selected by the buyer and 'to change the products selected by the buyer to other products'. There is a 'Change' key and a 'Cancel' key to cancel the current step and proceed to the previous step. For example, if a buyer wants to change the capacity of a memory and purchases it, the buyer clicks the 'change' key located at the bottom center of the screen and clicks the 'detail' key located to the right of 'memory' in the product list. A subscreen like 3k is displayed. When the buyer moves the bar using the navigation keys (▲ or ▼) on the sub screen, fixes the bar to the item, and clicks the 'setting' key, the sub screen disappears and the changed memory is displayed in the 'Memory' column. The total price is calculated by adding up the changed price of the memory. If you want to change the product list other than memory, proceed as in the memory change method. When the purchaser is satisfied with the list of products and the total amount displayed on the order request page, the buyer clicks the 'OK' key to exit the order request page.

If the purchaser is not a member of the quotation site, clicking the 'confirmation' key of FIG. 3k outputs the member registration page as shown in FIG. 3l. The buyer enters all the information printed on the member registration page in the corresponding item. As shown in FIG. 3L, 'E-mail address' is a field for inputting a buyer's E-mail ID, 'Contact phone number' is a field for inputting a buyer's contact phone number, and 'Address for receiving goods' Is a column for inputting an address where a buyer can receive a purchased product from a seller, and 'other details and notes' are fields for entering details of the product to be purchased and what the operator or seller wants. After the purchaser has entered all the above items, clicking the 'Apply' button ends the registration process. At this time, if you want to cancel the membership registration process, click the 'Cancel' button. The pages as described above (FIGS. 3A to 3L) are merely exemplary and may add or change a function according to an operator's selection of a virtual store.

4A and 4B are flowcharts illustrating an order receiving process and an order processing process of a method for calculating a quote according to the present invention, wherein an operator of a virtual store stores seller information in a database and selects and outputs a desired product from the stored database. It is assumed that a quote site can be opened and registered on the Internet, and a buyer also registers on the Internet.

First, the buyer enters the URL of the virtual store by using the web browser of the client 21, receives the front office (FIG. 3a) from the web server 22 of the virtual store, and visits the estimating site (402). In order to visit the front office, the buyer inputs the URL of the virtual store to purchase the product in the URL input box of the web browser and transmits the URL to the web server 22 of the virtual store. When the web server 22 of the virtual store receives the transmitted URL, it transmits the front office to the browser of the client 21. Here, the front office transmitted from the web server 22 to the web browser of the client 21 is transmitted in the form of HTML document.

When visiting the front office, the buyer selects a product to purchase (404). To assist in understanding the invention, it is assumed that the purchaser selects a computer as a product to purchase. When you select a computer from the proteoffice, the member enters the member ID and each product (e.g. CPU, memory, board, VGA, monitor, etc.) to be purchased and the buyer's preference for each product. Optionally, the amount of money presented is entered (406). Here, the input of the presentation amount may or may not be input by the purchaser. The method for inputting the taste of the buyer is input based on Figs. 3C to 3H.

The web server 22 of the virtual store determines whether or not the purchaser inputs the presented amount in step 406 (408). As a result of the determination, if the purchaser does not input the presented amount, the order processing program 24 searches for seller information stored in the database in association with the database server 25 (410). In addition, the order processing program 24 combines each product according to the buyer's taste entered in step 406 based on the searched data, and outputs the combined data to the buyer by classifying the combined data by price range. The recommended product is combined (412).

As a result of the determination of the step 408, if the purchaser inputs the presented amount, the order processing program 24 searches for seller information stored in the database in association with the database server 25 (414). Further, the order processing program 24 combines the respective products according to the buyer's taste and the amount of money inputted by the buyer in step 406 based on the retrieved data (416). The order processing program 24 compares the price of the products input in the step 408 with the price of the products combined in the step 416 to determine whether the amount of the presentation is within the price range of the combined products (418). . As a result of the determination, if the presented amount is not included in the price range of the combined products, the user is notified of the fact and a content to be modified to input a new condition is output to the buyer's web browser (420). When the content to be corrected is output to the web browser, the flow returns to step 406 where the buyer enters a new quotation condition and performs subsequent subsequent steps. As a result of the determination in step 418, if the presented amount is included in the price range of the combined products, the buyer's web browser forms a product list that forms the combined products into one group so that the buyer can search for the combined products. Output to (422). In addition, if the buyer does not enter the amount presented in the step 408, the buyer's web to form a list of products forming the recommended products in a group so that the buyer can search for the recommended products combined in the step 412 Print to browser

When the product list is displayed in the buyer's web browser, the buyer selects a product list to purchase (424). When the purchaser selects the product list, the order processing program 24 displays details of the selected product list, and determines whether or not each part of the selected product list is satisfied by the buyer (426). As a result of the determination, if the buyer is not satisfied with the selected product list, the buyer receives the information about the new part and changes it to the desired part (428). After the buyer is satisfied with the product list selected in the step 426 or changes to a new part in the step 428, the purchaser inputs a purchase application intention to finally purchase the corresponding product (430).

If the purchase request is finally input by the buyer in the step 430, the order processing program 24 determines whether the buyer is a member (432). Whether or not the buyer is a member may determine whether the buyer is a member by checking whether the member ID has been entered in step 406. As a result of the determination in step 432, if the purchaser is not a member, the order processing program 24 allows the purchaser to receive items related to membership registration (e.g., an e-mail address, a contact phone number, an address to receive a product, etc.) after the final purchase application. Other detailed orders and memos, etc.) is sent to the purchaser's web browser to register the page, and the buyer writes the item and resends it to the web server 22 (434). When the purchaser is a member in step 432 and when the purchaser intervenes an item related to member registration in step 434, the order processing program 24 transmits an order processing result to the buyer and seller (436). . At this time, if the buyer is not a member, the member ID is transmitted together.

Payment can be made by cash or card, and the seller delivers the product within a predetermined time period (usually 5-7 days) when the seller receives the order processing result from the operator of the virtual store. When the product is delivered, the buyer closely examines whether the received product is the one he or she originally wanted to purchase, and if satisfied with the delivered product, the buyer pays the purchase price and if not satisfied with the delivered product Returns the product to the seller and notifies the operator of the virtual store. In addition to the above payment method, the buyer first pays for the goods and then receives the goods, the buyer pays a part of the goods and the other goods are paid after the goods are delivered. There are several ways to deliver to the buyer, the buyer pays the full price of the product, and then the seller delivers the rest of the product to the buyer. In addition, the operator of the virtual store may act as a relay for the product price.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and the scope of application of the present invention is not limited to these, and may be appropriately changed within the scope of the same idea. For example, the shape and structure of each component shown in the embodiments of the present invention can be modified. In addition, the present invention can be widely used in various ways.

As described above, according to the method of calculating a quotation using a database according to the present invention, by displaying a list of products in accordance with a buyer's taste or a suggested amount, the buyer needs to visit several sites. There is an effect that the buyer can select the desired product at a suitable price according to the buyer's taste without multiple parts.

The conventional estimating method is easy to access only if you need to know all the information of the product, the estimation method of the present invention has the effect that can be determined by comparing several products in real time without knowing the information of all products.

In addition, the operator of the virtual store secures the seller information, registers only the verified seller, updates the respective information in conjunction with the database as necessary by updating the registered seller information and the buyer information in a database, and whenever there is a change, It is possible to provide the buyer with the latest information based on the updated data, and to respond quickly to the buyer's application for order.

Claims (3)

The operator of the virtual store stores the seller information in a database, and when the buyer enters the address of the virtual store, the web server of the virtual store verifies the buyer's address, sends the front office to the buyer's browser, and the buyer's request When the buyer transmits the product to be purchased, the buyer calculates the quotation using the database to determine whether to purchase the transmitted product, A first output step of outputting a condition for the basic quotation for grasping the taste of the buyer according to the product which the buyer wants to purchase; A second output step of outputting a product list by combining a product suitable for a buyer's taste by searching a database if the buyer inputs a condition for a basic quotation according to the first output step; When the buyer selects a desired product according to the product list of the second output step, informing the detailed information about the selected product and determining whether the buyer is satisfied with the selected product; Inputting an intention to purchase a product when the purchaser is satisfied with the product selected by the purchaser; and inputting a purchase application after changing to a desired product when the purchaser is not satisfied with the selected product; The operator of the virtual store, if the buyer enters the purchase intention in the input step, transmitting the order processing results to the buyer and the seller; Quote calculation method using a database, characterized in that consisting of. The method of claim 1, wherein the first output step Outputting by adding the presenting amount of the buyer to the condition for the basic quotation; When the buyer inputs a condition for the basic quotation, searching the database to combine products suitable for the taste and the presented amount of the buyer; Determining whether the price of the product combined in the combining step is included in the presented amount; And if the price of the combined product is not included in the presented amount, instructing to modify a new condition, and if the price of the combined product is included in the presented amount, outputting the combined product list in the combining step. Estimation calculation method using a database. The method of claim 1, wherein the input step Determining whether the buyer is a member after the buyer inputs a purchase intention; If the purchaser is not a member by the determining step, performing a new member registration process; further comprising the estimate calculation method using a database.