Product sales data processing device and product sales data processing system

Abstract

To provide a commodity sales data processing device having displays on a clerk side and a customer side, in which usability of the display on the customer side is improved.SOLUTION: Provided is a commodity sales data processing device having a plurality of displays having different dimensions, including: display means for controlling display on a first display having larger dimensions and display on a second display; and setting means for setting a specific display area among a plurality of display areas displayed on the first display, in which the display means displays the specific display area set by the setting means on the second display without any change in display form.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a merchandise sales data processing device and a merchandise sales data processing system having a plurality of display units. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been known a product sales data processing device such as a POS terminal having a display unit on both the salesclerk side and the customer side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-26776 A Summary of the Invention [Problem to be solved by the invention]

[0004] POS terminals installed in restaurants and other establishments, which have a display unit on both the store clerk side and the customer side, can promote sales by displaying advertisements for products and stores on the customer side display while the product registration process is being performed on the store clerk side display when paying for a product.

[0005] A POS terminal having a display unit on both the store clerk side and the customer side as described above can diversify the usage patterns of the POS terminal by enabling the store clerk to perform various operations such as product registration on the customer side display as well, and can also improve maintainability and operability.

[0006] The embodiment aims to improve the usability of the display unit on the customer side in a product sales data processing system such as a POS terminal having a display unit on both the salesclerk side and the customer side. [Means for solving the problem]

[0007] One embodiment is a 3D printer with different dimensions. The first and second display sections are To the salesperson and the customer Back to back, without switching positionsA product sales data processing device having: than the second display unit Large dimensions The above Display for store clerk on the first display unit and The above The display unit controls the display on the second display unit, and the setting unit sets a specific display area from among a plurality of display areas for store clerks displayed on the first display unit, and the display unit sets the display area set by the setting unit based on a predetermined operation on the second display unit. The above Without changing the display format of the display area for the specific store clerk on the first display unit The above A product sales data processing device that displays product sales data on a second display unit. [Brief description of the drawings]

[0008] [Figure 1] 1A and 1B are perspective views of a POS terminal (product sales data processing device) according to an embodiment, in which FIG. 1A is an overall perspective view, and FIGS. [Diagram 2] FIG. 1 is a schematic block diagram of a POS terminal according to an embodiment; [Diagram 3] FIG. 1 is an example of a schematic block diagram of a product sales data processing system according to an embodiment; [Figure 4] 13 is an example of a product registration screen displayed on a store clerk display unit of the POS terminal according to an embodiment. [Diagram 5] 13 is an example of an operation screen displayed on a customer display unit of the POS terminal of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] -Configuration of POS terminal (product sales data processing device)- The product sales data processing device will be described with reference to the drawings, taking as an example a POS terminal having a display unit on both the salesperson side and the customer side. The POS terminal 1 of the present embodiment is a device in which a store clerk at a restaurant or other eating establishment registers products purchased by a customer, and the customer can operate the terminal to make a payment by himself or herself.

[0010] The POS terminal 1 of this embodiment has a main body 11 and an operating body 12 arranged on the upper surface of the main body 11, as shown in Figure 1(a), and the operating body 12 has a customer display unit (second display unit) 121 on the front side (customer side) and a clerk display unit (first display unit) 122 on the back side (clerk side) which is larger in size than the customer display unit 121, as shown in Figures 1(b) and (c). The POS terminal 1 of this embodiment employs a 15-inch touch panel as the store clerk display unit 122, and a 10-inch horizontally elongated touch panel as the customer display unit 121.

[0011] The operating body 12 of the POS terminal 1 has a scanner unit 123 adjacent to a customer display unit 121 on the front (customer side), a receipt issuing unit 124 on the top surface, and a camera 125, etc., are provided as necessary.

[0012] The main body 11 of the POS terminal 1 is provided with a bill insertion slot 114, a bill return slot 115, a coin insertion slot 116, a coin return slot 117, etc. on the front side. In addition, a return lever that is operated to instruct the return of change, etc. may be provided. The POS terminal 1 may also have a speaker that outputs information about the operation of the POS terminal 1 to the customer by voice.

[0013] The bill insertion slot 114 is used for inserting bills when making a deposit, and the bill return slot 115 is used for discharging bills when giving change or returning money. The coin insertion slot 116 is used for inserting coins when making a deposit, and the coin return slot 117 is used for discharging coins when giving money.

[0014] The store clerk operates the store clerk display unit 122 to register the products purchased by the customer, and the customer operates the customer display unit 121 to perform payment for the products that the store clerk has registered.

[0015] When paying for a product with electronic money, the customer can make the payment by using the scanner unit 123 to read a barcode such as a QR code (registered trademark) displayed on the customer's smartphone or the like. When paying for goods with a credit card, the credit card information is read by the scanner unit 123 and the personal identification number is entered using the numeric keypad to complete the payment.

[0016] FIG. 2 shows an example of the configuration of the POS terminal 1 of the present embodiment. The POS terminal 1 of this embodiment includes a CPU 101, a ROM 102, a RAM 103, a memory 104, a network I / F 105, an input unit I / F 106, an output unit I / F 107, a display unit I / F 108, and the like.

[0017] The CPU 101 is a control unit that controls the overall processing operation of the POS terminal 1 . For example, the CPU 101 functions as a registration unit that executes a product registration process and a payment process, and as a display unit that controls the customer display unit 121 and the store clerk display unit 122.

[0018] The ROM 102 prestores programs and the like for operation by the CPU 101. The programs and the like may be stored in a portable storage medium such as a CD-ROM and read by an external device such as a CD-ROM drive.

[0019] The RAM 103 is used as a work storage area necessary for storing programs and for the software to operate. The memory 104 is composed of a hard disk device or the like, and stores information such as product files.

[0020] The network I / F 105 is a circuit for transmitting and receiving data to and from a connected device via a wired or wireless network or a dedicated line. The input unit I / F 106 is a circuit for performing input / output with an input unit such as a scanner unit 123 . The output unit I / F 107 is a circuit for inputting and outputting data to and from an output unit such as the receipt issuing unit 124 . The display unit I / F 108 is a circuit for performing input and output with display units such as a customer display unit 121 and a store clerk display unit 122 .

[0021] The POS terminal 1 of this embodiment also has an operation input unit such as a return lever, and the CPU 101 executes control processing such as returning change in response to operations performed on the operation input unit. The POS terminal 1 also has a banknote processing unit 201 and a coin processing unit 202.

[0022] An input unit such as a scanner unit 123 reads code information such as a QR code (registered trademark) that a customer displays on a smartphone or the like to pay a fee, and credit card information. An output unit such as a receipt issuing unit 124 issues a receipt for the purchased item in accordance with instructions from the CPU 101.

[0023] The banknote processing unit 201 performs all processes related to banknotes. Specifically, the banknote processing unit 201 determines the type of banknote inserted from the banknote insertion slot 114 as a banknote authentication process. The banknote processing unit 201 also counts the number of banknotes of each denomination inserted from the banknote insertion slot 114. When returning change, the banknote processing unit 201 selects banknotes of the required denomination from among the banknotes stored in the banknote storage inside the POS terminal 1, and discharges the required number of banknotes to the banknote return slot 115.

[0024] The coin processing unit 202 performs general processing related to coins. Specifically, the coin processing unit 202 executes operations such as coin authentication processing, counting the number of coins by denomination, selecting coins of a required denomination from among the coins stored inside the POS terminal 1, and discharging them from the coin return port 117.

[0025] - Product sales data processing system configuration - FIG. 3 shows an example of the configuration of a product sales data processing system configured using the POS terminal 1. The product sales data processing system of this embodiment is configured to connect a management device (store controller) 2 and a POS terminal (POS register) 1 via a network 5, and to perform data communication between the devices. The network 5 may be either wired or wireless. A plurality of POS terminals 1 may be installed, and a registration device 3 dedicated to registration, a settlement device 4 dedicated to settlement, etc. may be further connected.

[0026] The management device 2 is a computer (which may be a cloud server, for example) that controls the entire product sales data processing system, and manages various data used by the POS terminal 1, registration device 3, and settlement device 4, stores product data and distributes it to each device as appropriate. The management device 2 also receives billed data that has been processed by the POS terminal 1, settlement device 4, etc. after accounting, stores the received billed data, and performs tasks such as tallying up actual results.

[0027] The registration device 3 is, for example, a device dedicated to the registration process of products purchased by customers, and the registration process is performed by a store clerk's product registration operation. Information on the products registered by the registration process is transmitted to the settlement device 4 and the like. The settlement device 4 is, for example, a device dedicated to the transaction processing of products purchased by a customer, and the transaction processing is performed by a store clerk or the customer himself using the product information etc. transmitted from the registration device 3.

[0028] -Display control of POS terminals- The POS terminal 1 of this embodiment displays a product registration screen for product registration, etc., on the store clerk display unit 122. The store clerk can execute the registration process of the product purchased by the customer by operating an operation unit such as a preset key on the product registration screen displayed on the store clerk display unit 122.

[0029] The POS terminal 1 displays advertisements for sales promotion and a checkout screen for customers to operate themselves on the customer display unit 121. Customers can operate the checkout screen displayed on the customer display unit 121 to carry out the checkout process for the purchased products.

[0030] An example of a product registration screen 800 displayed on the store clerk display unit 122 is shown in FIG. The product registration screen 800 of this embodiment has a key area 810, a product list area 820, and a numeric keypad area 830. The key area 810 has a first area 810a in which preset keys (operation unit) are arranged to be used when selecting a product to be registered, a second area 810b in which preset keys (operation unit) are arranged when the store clerk processes the payment, and a third area 810c in which other keys (operation unit) are arranged.

[0031] When a store clerk operates (touches) one of the preset keys (operation unit) arranged in the second area 810b, the POS terminal 1 displays in the first area 810a the information for the settlement process corresponding to the preset key, and the store clerk can perform the necessary operations to avoid any problems during the settlement process. The preset keys arranged in the second area 810b display high-priority preset keys that may be operated by a store clerk when dealing with a problem.

[0032] In the third area 810c, keys (operation parts) other than the keys arranged in the first area 810a and the second area 810b are arranged. For example, in the third area 810c, the POS terminal 1 arranges a business day setting key for setting a business day to be executed before opening a store, a change preparation key for setting a change fund, and the like. When a store clerk operates the business day setting key or the change preparation key, the POS terminal 1 displays a screen for setting the business day or a screen for preparing the change on all or part of the store clerk display unit 122. In addition, the POS terminal 1 may display a screen for setting a business day or a screen for preparing change in the first area 810a of the clerk display unit 122 when the clerk operates the business day setting key or the change preparation key.

[0033] 4 is an example in which preset keys of products included in a product group of rice bowls are displayed in the first area 810a. The preset keys of the products displayed in the first area 810a can be changed in an appropriate manner. The store clerk then operates the preset keys for the Oyakodon (large) and Tianjindon displayed in the first area 810a, and the registered products are displayed in the product list area 820.

[0034] As described above, the first area 810a of the product registration screen 800 displayed on the store clerk display unit 122 is a display area that is frequently operated by store clerks, and through daily use, the store clerk will become accustomed to the display format and be able to carry out their daily work smoothly. It is also a display area that collects the minimum number of operation parts that are required for a store clerk to perform product registration and payment processing. Therefore, the registration and payment processing can be completed using only the operation parts within the display area.

[0035] In recent years, self-checkout, where customers can register products or perform checkout themselves, has become more common, and the usage patterns of the POS terminal 1 have become more diverse. For example, the POS terminal 1 may be used as a self-checkout POS terminal by utilizing the customer display unit 121 of the POS terminal 1, or as a checkout device by utilizing the customer display unit 121.

[0036] In such a situation, a customer may call a store clerk and have the clerk operate customer display unit 121 to proceed with the process. For example, when a customer is about to perform self-checkout and there is an item they did not order (that they do not plan to purchase) inside the machine (case 1), when they intend to pay by credit card or other method but change the payment method midway through (case 2), when they remember that they have a discount ticket or coupon ticket midway through payment (case 3), when the change tray is jammed and the customer is unable to assist (case 4), or when it is easier to use the customer display unit 121 for maintenance, etc. (case 5), a store clerk may operate the customer display unit 121 to perform the process. It should be noted that the cases in which the store clerk operates the customer display unit 121 are not limited to those described above.

[0037] However, because the customer display unit 121 and the clerk display unit 122 have different dimensions and aspect ratios, the content that is displayed on the clerk display unit 122 that the clerk is accustomed to cannot be displayed as is on the customer display unit 121. The clerk may be confused by the screen displayed on the customer display unit 121 in a different display format than usual, and may not be able to operate it smoothly.

[0038] The POS terminal 1 of this embodiment improves the operability of the customer display unit 121 by the store clerk by displaying specific display areas, such as display areas on the store clerk display unit 122 that are frequently operated by the store clerk, in the same display format on the customer display unit 121, which has different dimensions and aspect ratios. The specific details will be explained below.

[0039] As shown in FIG. 4, the store clerk display unit 122 of the POS terminal 1 of this embodiment has a vertical dimension y1 and a horizontal dimension x1, and a product registration screen 800 has a plurality of display regions (areas) arranged thereon. The position and display dimensions of each display area are set, and the first area 810a is positioned in the center of the product registration screen 800 with a vertical dimension y and a horizontal dimension x, the second area 810b is positioned to the right of the first area 810a, and the third area 810c is positioned above the first area 810a and the second area 810b. Furthermore, the product list area 820 and the numeric keypad area 830 are set to be disposed to the left of the first area 810a and the third area 810c.

[0040] The layout of the areas can be set in a different pattern than the above. For example, the third area 810c can be set to be located below the first area 810a and the second area 810b.

[0041] On the other hand, since the customer display unit 121 has a vertical dimension y2 (< y1) and a horizontal dimension x2 (≤ x1) that are smaller than those of the store clerk display unit 122, the product registration screen (the operation screen for the store clerk) 800 displayed on the store clerk display unit 122 cannot be displayed as it is. Therefore, when a store clerk operates the customer display unit 121, the POS terminal 1 according to the present embodiment is configured to display, as it is without changing the display form, the first area 810a (a specific display area) with a high operation frequency of the store clerk on the product registration screen (operation screen) as shown in FIG. 5.

[0042] Note that displaying as it is without changing the display form in the POS terminal 1 according to the present embodiment means, for example, displaying with the same dimensions without changing the vertical and horizontal dimensions x and y of the first area 810a, and displaying without changing the size and arrangement of the preset keys (operation units) displayed in the first area 810a. Further, the font or the like indicating the content of the preset keys may be displayed in the same font without changing.

[0043] An example of the operation screen for the store clerk displayed on the customer display unit 121 of the POS terminal 1 is shown in FIG. 5. In the operation screen 900 of the customer display unit 121 according to the present embodiment, for each display area (area), the position where it is arranged and the display dimension are set. For the first area 810a with the highest operation frequency, it is arranged at the center of the customer display unit 121 without changing the display form, and the second area 810b is vertically reduced and arranged as a new second area 910b in the area above and to the right of the first area 810a.

[0044] Then, the "Next" key 910c is arranged in the second area 910b without displaying the third area 810c, and when the store clerk operates the "Next" key 910c, the second area 910b or the first area 810a is displayed. In addition, the numeric keypad area 830 that was located below the product list area 820 has been moved below the second area 810b and displayed as a new numeric keypad area 930, thereby ensuring sufficient product list area 920.

[0045] As described above, by displaying a specific display area (first area 810a, which is frequently operated) without changing its display format on the customer display unit 121, which has a small screen size, the store clerk can perform smooth screen operations without confusion.

[0046] -Display area settings- The layout of each display region (area) arranged on the store clerk display unit 122 on the customer display unit 121 may be set for each display region in the same manner as the setting of each display region arranged on the store clerk display unit 122, and is executed by the setting means (CPU 101) through the setting operation of the store clerk. The set information may be stored in a RAM or the like as a table.

[0047] For example, when displaying each display area of ​​the clerk display unit 122 of the POS terminal 1 of this embodiment on the customer display unit 121, the center position is set as the display position for the first area 810a, which is operated most frequently, and the dimensions are set to a magnification of 100% (area where the display form is not changed) relative to the dimensions displayed on the clerk display unit 122. The vertical and horizontal dimensions of the display area may be directly set to the same values ​​as those of the store clerk display unit 122 .

[0048] In addition, for the second area 810b, the upper right position is set as the display position on the operation screen displayed on the customer display unit 121, and a vertical magnification of 60% is set as the magnification relative to the dimensions displayed on the store clerk display unit 122.

[0049] Similarly, for the product list area 820, the display position on the operation screen displayed on the customer display unit 121 is set to the left position, and a magnification of 110% is set with respect to the dimensions displayed on the store clerk display unit 122; and for the numeric keypad area 830, the display position is set to the bottom right position, and a magnification of 40% is set with respect to the dimensions displayed on the store clerk display unit 122.

[0050] Furthermore, for the third area 810c, the right position is set as the display position on the operation screen displayed on the customer display unit 121, and a magnification of 0% is set with respect to the dimensions displayed on the store clerk display unit 122, so that it is set to be displayed as a single operation key (e.g., the "Next" key 910c) and is set to be displayed in either display area by operating the "Next" key 910c. As described above, by setting the display position when displayed on customer display unit 121 and the magnification (or dimensions) relative to the dimensions displayed on store clerk display unit 122 for each display area, it is possible to display based on the set information when a display instruction is given on customer display unit 121.

[0051] In addition, the POS terminal 1 may set a priority in advance for each display area displayed on the store clerk display unit 122, so that the specific display area (first area 810a) set with the highest priority is displayed without changing the display format, and the screen dimensions and shape of each of the other display areas are automatically determined according to the priority and allocated to the customer display unit 121 for display. Additionally, the display settings on the customer display section 121 of each display area may be performed in any manner.

[0052] -Specific display area restrictions- Next, the restriction on the display area displayed on the store clerk display unit will be described. In the POS terminal 1 of this embodiment, the clerk display unit 122 is a 15-inch screen with a vertical dimension y1 and a horizontal dimension x1, and the customer display unit 121 is a 10-inch horizontal screen with a vertical dimension y2 and a horizontal dimension x2, so that it is not possible to place an area on the customer display unit 121 that is larger than the vertical dimension y2 or larger than the horizontal dimension x2.

[0053] Therefore, the POS terminal 1 of this embodiment restricts the vertical and horizontal dimensions of a specific display area (first area 810a) placed on the product registration screen 800 displayed on the store clerk display unit 122 so that the vertical dimension cannot be set to more than y2 or the horizontal dimension cannot be set to more than x2. For example, when setting the display area of ​​the product registration screen 800 to be displayed on the clerk display unit 122 of the POS terminal 1, if a display area larger than the dimensions of the customer display unit 121 is set, the restriction means (CPU 101) may control the setting to be invalid. Also, when setting the display area, a message that cannot be set may be displayed or a notification sound may be emitted to notify of an error.

[0054] -Other embodiments- In the above embodiment, an example of a POS terminal 1 having a store clerk display unit 122 and a customer display unit 121 has been described, but the store clerk display unit and the customer display unit do not have to be provided on the same device.

[0055] For example, the operation screen 900 operated by a store clerk may be displayed on the display unit of a checkout device of a product sales data processing system consisting of multiple devices connected via a network, and the device equipped with the display unit for displaying the operation screen 900 is not limited. In addition, when the product registration data processing system is composed of multiple devices as described above, the restriction on the specific display area may be restricted so that a display area larger than the dimensions of the display unit of each device that makes up the system cannot be set.

[0056] Furthermore, the screen including the specific display area is not limited to the product registration screen. For example, it may be a maintenance screen or setting screen for a registration device, settlement device, etc. A partial area of ​​the maintenance screen, setting screen, etc. may be set as a specific display area so that the display form is not changed regardless of which display unit is used to display the screen.

[0057] Furthermore, the specific display area displayed in the same display form on the customer display unit 121 does not have to be the most frequently operated display area. A display area that the store clerk desires to always display in the same display form may be set as a specific display area whose display form is not changed. In other words, a specific display area among the multiple display areas displayed on the operation screen displayed on the store clerk display unit 122 may be displayed in the same display format on all display units in the product sales data processing system.

[0058] Furthermore, there is no limitation on the method of displaying the operation screen operated by the store clerk on the customer display unit 121. For example, by touching an appropriate area of ​​the customer display unit 121 on which the settlement screen is displayed an appropriate number of times (e.g., three times), a screen for inputting an employee ID and password may be displayed, and the store clerk may input the employee ID and password to display the store clerk operation screen 900 on the customer display unit 121.

[0059] In addition, for areas other than the specific display area that is displayed in the same display format, the display position and magnification of the operation units arranged in the area on the customer display unit 121 may be set for each operation unit arranged in the area. For example, in the store clerk display unit 122, keys (operation unit) arranged in the third area 810c may be arranged in the customer display unit 121 in the second area 910b.

[0060] In addition, in cases where the display screen is small and the specified display area cannot be displayed even if the entire screen is used, the entire display area may be displayed by scrolling without changing the size and arrangement of the operating parts (keys) arranged in the display area.

[0061] Also, depending on the content of the process performed by the store clerk operating customer display unit 121, it may be determined whether or not the display form of a specific display area is to be the same display form. For example, the above describes an example in which a store clerk operates the customer display unit 121. In the above cases 1 to 3, the POS terminal 1 may display an operation screen 900 on the customer display unit 121, which shows a specific display area (first area 810a) in the same display format, as shown in FIG. 5.

[0062] The store clerk can use keys such as the pre-checkout register key displayed in the second area 910b of the customer display unit 121 and the preset keys displayed in the first area 810a to modify the information about the product that the customer is purchasing.

[0063] On the other hand, in the above cases 4 and 5, since no correction processing of product information is performed and no preset keys for the product group are required, it is possible to display a screen for error processing such as a jammed change or a screen for maintenance, instead of displaying a specific display area (first area 810a) in the same display format.

[0064] In addition, whether or not a specific display area is to be displayed in the same display format on customer display unit 121 may be determined by a store clerk when the operation screen is displayed on customer display unit 121. For example, after the store clerk inputs an employee ID and a password into an employee ID and password input screen in order to display an operation screen on customer display unit 121, the store clerk may be able to select the operation screen to be displayed.

[0065] In addition, after the store clerk enters the employee ID and password on the employee ID and password input screen, the operation screen 900 shown in FIG. 5 may be displayed once, and an operation key for switching to the maintenance screen may be displayed by operating the "Next" key 910c on the operation screen 900. Alternatively, the determination as to whether the display mode of a specific display area is to be the same display mode may be performed in any other manner.

[0066] Each process executed by the product sales data processing system may be performed by any device connected via the network. For example, a data processing system may be constructed in which each process such as product registration processing, settlement processing, etc. is performed on a management device (cloud server, etc.) 2 or another cloud server, and the POS terminal transmits input information entered from a scanner, touch panel, etc. to the management device 2 and displays image information transmitted from the management device 2 on a display screen.

[0067] It goes without saying that the above embodiments do not limit the invention described in the claims, but are treated as examples.

[0068] -Effects of the data processing system according to the embodiment- 2. Description of the Related Art Conventionally, there has been known a product sales data processing device such as a POS terminal having a display screen on both the salesclerk side and the customer side. POS terminals installed in restaurants and other eating establishments, which have display screens on both the staff side and the customer side, can promote sales by displaying product and store advertisements on the customer side display while the product registration process is being performed on the staff side display when paying for a product.

[0069] A POS terminal having a display screen on both the store clerk side and the customer side as described above can diversify the usage patterns of the POS terminal and improve operability by making it possible to perform product registration processing, etc. on the customer side display screen as well.

[0070] According to the product sales data processing system of this embodiment, a specified display area can be displayed in the same display format in each device that makes up the product sales processing system, and store clerks can operate the customer display unit using an operation screen that they are familiar with, making product registration operations, setting operations, and maintenance operations smoother and more efficient. [Explanation of symbols]

[0071] 1: POS terminal 121:Customer display section (second display section) 122: Display section for clerk (1st display section) 800: Product registration screen 810a: First area (display area) 810b: Second area (display area) 810c: Third area (display area) 900: Operation screen

Claims

1. A product sales data processing device having a first display unit and a second display unit of different sizes arranged back-to-back on a salesperson side and a customer side, respectively, without changing positions, a display unit for controlling a display for a store clerk on the first display unit, which is larger than the second display unit, and a display on the second display unit; a setting means for setting a specific display area from among a plurality of display areas for store clerks displayed on the first display unit; The display means is a product sales data processing device that displays on the second display unit the display area for the specific store clerk on the first display unit that is set by the setting means based on a specified operation on the second display unit without changing the display format.

2. A product sales data processing system having a first display unit and a second display unit of different sizes arranged back-to-back on a salesperson side and a customer side, respectively, without interchanging positions, a display unit for controlling a display for a store clerk on the first display unit, which is larger than the second display unit, and a display on the second display unit fixed on the customer side; a setting means for setting a specific display area from among a plurality of display areas for store clerks displayed on the first display unit; The display means displays on the second display unit the display area for the specific store clerk on the first display unit that is set by the setting means based on a specified operation on the second display unit without changing the display format.

Images