Processing device, portable terminal, processing method, and program

Abstract

To provide a processing device, a portable terminal, a processing method, and a program capable of reducing a possibility to forget to receive small changes.SOLUTION: A processing device includes: a sound detection section for detecting a first sound in accounting of merchandise in a self-register and a second sound indicating generation of small changes in the self-register, and also detecting a volume of the second sound; a comparison section for comparing a first volume of the second sound detected by the sound detection section and a second volume of the second sound detected this time by the sound detection section when the sound detection section detects the first sound and the second sound and then detects the second sound again; and an output section for outputting warning when the second volume is smaller than the first volume.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a processing device, a mobile terminal, a processing method, and a program. [Background technology]

[0002] In stores that have self-checkout registers (automatic payment machines), customers can use the self-checkout register to pay. When change is due, the self-checkout register notifies the customer by making a sound or displaying a message. If the customer does not notice the sound or message, there is a risk that they will forget to take their change.

[0003] For example, Patent Document 1 describes a device that prevents customers from forgetting to take their change. The device detects the customer's line of sight, and if the customer's line of sight is not directed toward the change outlet, it displays information indicating that change is available. The device also detects whether or not the change has been removed from the outlet, and if the change has not been removed, it sounds an alarm. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-212459 Summary of the Invention [Problem to be solved by the invention]

[0005] The device described in Patent Document 1 can prompt customers who are near the device to receive their change. However, if the customer leaves the device without noticing the information displayed or the alarm sound, the device will not be able to notify the customer that change is due.

[0006] An object of the present disclosure is to provide a processing device, a mobile terminal, a processing method, and a program that solve the above-mentioned problems. [Means for solving the problem]

[0007] A processing device according to one embodiment of the present disclosure includes a sound detection unit that detects a first sound that indicates the transaction of a product at a self-checkout register and a second sound that indicates the receipt of change at the self-checkout register, and detects the volume of the second sound; a comparison unit that, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, compares the first volume of the second sound previously detected by the sound detection unit with the second volume of the second sound currently detected by the sound detection unit; and an output unit that outputs an alarm if the second volume is smaller than the first volume.

[0008] A processing method according to one embodiment of the present disclosure includes a step in which a sound detection unit detects a first sound of a product being checked out at a self-checkout register and a second sound indicating the receipt of change at the self-checkout register, and detects the volume of the second sound; a step in which, when the sound detection unit detects the first sound and the second sound again after detecting the first sound and the second sound, a comparison unit compares the first volume of the second sound previously detected by the sound detection unit with the second volume of the second sound currently detected by the sound detection unit; and a step in which an output unit outputs an alarm if the second volume is smaller than the first volume.

[0009] A program according to one embodiment of the present disclosure causes a computer to perform the following steps: detect a first sound indicating the transaction of a product at a self-checkout register and a second sound indicating the receipt of change at the self-checkout register, and detect the volume of the second sound; when the second sound is detected again after detecting the first sound and the second sound, compare the first volume of the second sound detected previously with the second volume of the second sound detected this time; and output an alarm if the second volume is lower than the first volume. [Effects of the Invention]

[0010] According to the above aspect, the possibility of forgetting to take change can be reduced. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a hardware configuration diagram of a mobile terminal according to the present disclosure. [Figure 2] FIG. 2 is a functional block diagram of a mobile terminal according to the present disclosure. [Figure 3] 10 is a flowchart illustrating an operation of a mobile terminal according to the present disclosure. [Figure 4] 10 is a flowchart illustrating an operation of a mobile terminal according to the present disclosure. [Figure 5] FIG. 2 is a functional block diagram of a mobile terminal according to the present disclosure. [Figure 6] FIG. 2 is a functional block diagram of a processing device according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Each embodiment will be described below with reference to the drawings. In all drawings, the same or corresponding components are designated by the same reference numerals, and common descriptions will be omitted.

[0013] First Embodiment An embodiment of the present disclosure will be described below with reference to the drawings. Fig. 1 shows the hardware configuration of a mobile terminal 10 according to this embodiment. For example, the mobile terminal 10 is an electronic device such as a smartphone or a tablet terminal.

[0014] The mobile terminal 10 is a computer equipped with various hardware components, such as a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, other storage devices 104, a microphone 105, a display 106, and a speaker 107.

[0015] 2 shows the functional configuration of the mobile terminal 10. The mobile terminal 10 includes a processing unit 11, which includes a main control unit 20, a timer 30, a storage unit 40, a sound detection unit 50, and an output unit 60.

[0016] The main control unit 20 controls the entire processing device 11. The timer 30 measures time. The memory unit 40 is a non-volatile memory medium such as a flash memory. The sound detection unit 50 detects sounds generated by the self-checkout. The output unit 60 outputs an alarm to prompt the customer to receive their change.

[0017] The memory unit 40 stores an application (hereinafter referred to as "app") 41, a sound table 42, a timer table 43, and volume data 44. The app 41 is a program for executing a process to prompt the customer to receive change. The sound table 42 includes sound data for a first sound generated when various self-checkout registers read a code attached to an item to perform a transaction, and sound data for a second sound generated by various self-checkout registers to notify the customer that change is due. The code attached to the item includes information such as the item name and price. The self-checkout register generates the second sound at a certain volume. The timer table 43 includes timer values corresponding to the predetermined time for which various self-checkout registers continue to generate the second sound. The volume data 44 indicates the volume of the second sound detected by the sound detection unit 50. If the sound detection unit 50 detects the second sound multiple times, the memory unit 40 stores multiple pieces of volume data 44.

[0018] The sound detection unit 50 includes a microphone 51 and a microphone control unit 52. The microphone 51 detects sounds generated outside the mobile terminal 10. The microphone control unit 52 controls the microphone 51.

[0019] The output unit 60 includes a display 61, a display control unit 62, a speaker 63, and a speaker control unit 64. The display 61 is a display device such as a liquid crystal display, and displays information indicating an alarm to prompt the customer to receive their change. The display control unit 62 controls the display 61. The speaker 63 outputs an alarm sound to prompt the customer to receive their change. The speaker control unit 64 controls the speaker 63.

[0020] 3 and 4 are flowcharts showing the operation of the mobile terminal 10. The operation of the mobile terminal 10 will be described with reference to Fig. 3 and 4. The mobile terminal 10 starts the application 41. The main control unit 20, the microphone control unit 52, the display control unit 62, and the speaker control unit 64 perform the following processes in accordance with the application 41.

[0021] The microphone 51 detects a sound generated outside the mobile terminal 10 and outputs sound data corresponding to the volume of the sound to the microphone control unit 52. The microphone control unit 52 compares the sound data output from the microphone 51 with the sound data of a first sound registered in the sound table 42 of the storage unit 40, and determines whether the microphone 51 has detected the first sound (step S101).

[0022] When the sound data output from the microphone 51 does not match the sound data of the first sound, the microphone control unit 52 determines that the first sound has not been detected by the microphone 51. In this case, the microphone control unit 52 executes step S101 again.

[0023] When the sound data output from microphone 51 matches the sound data of the first sound, microphone control unit 52 determines that microphone 51 has detected the first sound. Microphone control unit 52 can detect that a customer is making a transaction using a self-checkout. At this time, microphone control unit 52 notifies main control unit 20 that the first sound has been generated. Microphone control unit 52 also compares the sound data output from microphone 51 with the sound data of the second sound registered in sound table 42 of memory unit 40, and determines whether microphone 51 has detected the second sound (step S102).

[0024] When the sound data output from the microphone 51 does not match the sound data of the second sound, the microphone control unit 52 determines that the second sound has not been detected by the microphone 51. In this case, the microphone control unit 52 executes step S102 again.

[0025] When the sound data output from microphone 51 matches the sound data of the second sound, microphone control unit 52 determines that microphone 51 has detected the second sound. Microphone control unit 52 can detect that change is available. At this time, microphone control unit 52 notifies main control unit 20 that the second sound has been generated. Furthermore, microphone control unit 52 measures the volume of the second sound based on the sound data output from microphone 51 and notifies main control unit 20 of the volume. Main control unit 20 stores volume data 44 indicating the volume of the second sound in memory unit 40 (step S103).

[0026] After step S103, the main control unit 20 obtains the timer value from the timer table 43 in the storage unit 40, and sets the timer value in the timer 30. The timer 30 starts a timer operation for measuring time (step S104).

[0027] If the pattern of the first sound or the second sound differs depending on the type of self-checkout register, the sound table 42 in the storage unit 40 may include identification information corresponding to the type of self-checkout register. The identification information is associated with the sound data of the first sound or the second sound. The main control unit 20 may obtain, from the sound table 42, the identification information associated with the sound data of the first sound or the second sound that matches the sound data output from the microphone 51.

[0028] The timer table 43 may include the above-mentioned identification information associated with the timer value. The main control unit 20 may obtain from the timer table 43 a timer value associated with the same identification information as the identification information obtained from the sound table 42. If the predetermined time for which the second sound continues to be emitted varies depending on the type of self-checkout register, the main control unit 20 can obtain the timer value corresponding to the type of self-checkout register.

[0029] A code corresponding to the type of self-checkout may be attached to the surface of the self-checkout. Alternatively, the self-checkout may display the code on its display. If the mobile terminal 10 has a camera, the main control unit 20 may detect the code from an image captured by the camera and obtain the identification information from the code.

[0030] Once the timer 30 has started its timer operation, it notifies the main control unit 20 of a timeout when a predetermined time corresponding to the timer value has elapsed. After step S104, the main control unit 20 determines whether the timer 30 has timed out, thereby determining whether the predetermined time has elapsed (step S105). If the timer 30 has timed out, the predetermined time has elapsed, and the process proceeds to step S106. If the timer 30 has not timed out, the predetermined time has not elapsed, and the process proceeds to step S107.

[0031] If the predetermined time has not elapsed, the main control unit 20 instructs the microphone control unit 52 to detect a second sound. The microphone control unit 52 executes the same process as in step S102 and determines whether the microphone 51 has detected the second sound (step S107).

[0032] If the microphone 51 has not detected the second sound, the process proceeds to step S112. If the microphone 51 has detected the second sound, the microphone control unit 52 notifies the main control unit 20 that the second sound has been generated. The microphone control unit 52 also measures the volume of the second sound based on the sound data output from the microphone 51, and notifies the main control unit 20 of the volume. The main control unit 20 stores volume data 44 indicating the volume of the second sound in the storage unit 40 (step S108).

[0033] In steps S103 and S108, the main control unit 20 may associate order information indicating the order in which the volume data 44 was generated with the volume data 44 and store the order information in the storage unit 40. For example, the order information is a sequence number or time information. Based on the order information, the main control unit 20 can distinguish between the volume data 44 of the second sound previously detected by the microphone 51 and the volume data 44 of the second sound currently detected by the microphone 51.

[0034] The storage unit 40 may include a first storage area and a second storage area for storing volume data 44. For example, when the microphone 51 detects a second sound for the first time, the main control unit 20 stores the volume data 44 of the second sound in the first storage area. When the microphone 51 detects the second sound for the second time, the main control unit 20 stores the volume data 44 of the second sound in the second storage area. Thereafter, each time the microphone 51 detects a second sound, the main control unit 20 stores the volume data 44 stored in the second storage area in the first storage area, and stores the volume data 44 of the second sound newly detected by the microphone 51 in the second storage area. The main control unit 20 can recognize the volume data 44 stored in the first storage area as the volume data 44 of the second sound previously detected by the microphone 51. Furthermore, the main control unit 20 can recognize the volume data 44 stored in the second storage area as the volume data 44 of the second sound detected by the microphone 51 this time.

[0035] After step S108, the main control unit 20 compares the first volume indicated by the volume data 44 of the second sound previously detected by the microphone 51 with the second volume indicated by the volume data 44 of the second sound currently detected by the microphone 51. The main control unit 20 determines whether the second volume is smaller than the first volume (step S109).

[0036] If the second volume is greater than the first volume, the process proceeds to step S111. If the second volume is less than the first volume, the process proceeds to step S105.

[0037] The mobile terminal 10 repeats steps S105, S107, S108, and S109 until the timer 30 times out. That is, the sound detection unit 50 repeatedly detects the second sound, and the main control unit 20 repeatedly compares the second volume for a predetermined period of time. By detecting that the volume of the second sound is gradually decreasing, the mobile terminal 10 can detect that the customer has left the self-checkout without receiving their change.

[0038] When the timer 30 times out and a predetermined time has elapsed, the main control unit 20 instructs the output unit 60 to output an alarm to prompt the customer to receive their change. The output unit 60 outputs the alarm (step S106).

[0039] Step S106 will be described in detail below. The main control unit 20 instructs the display control unit 62 to display information indicating the warning. The display control unit 62 holds in advance a table in which image data for displaying the information indicating the warning is registered. When the main control unit 20 instructs the display control unit 62 to display the information indicating the warning, the display control unit 62 outputs the image data to the display 61. The display 61 displays the information indicating the warning based on the image data.

[0040] The main control unit 20 also instructs the speaker control unit 64 to output an alarm sound. The speaker control unit 64 holds in advance a table in which sound data for the alarm sound is registered. When the main control unit 20 instructs the speaker control unit 64 to output an alarm sound, the speaker control unit 64 outputs the sound data for the alarm sound to the speaker 63. The speaker 63 outputs the alarm sound based on the sound data.

[0041] The speaker 63 may output an audible alarm without displaying information indicating an alarm on the display 61. Alternatively, the display 61 may display information indicating an alarm without outputting an audible alarm on the speaker 63. Alternatively, the display 61 may display information indicating an alarm, and at the same time the speaker 63 may output an audible alarm.

[0042] If the second volume is greater than the first volume in step S109, the microphone control unit 52 determines whether the second sound has stopped, and notifies the main control unit 20 of the determination result (step S111).

[0043] If the second sound has not stopped, the process proceeds to step S105. If the second sound has stopped, the main control unit 20 determines whether the timer 30 has timed out, thereby determining whether a predetermined time has elapsed (step S112). If the timer 30 has timed out, the predetermined time has elapsed, and the process ends. If the timer 30 has not timed out, the predetermined time has not elapsed, and the process proceeds to step S113.

[0044] If the predetermined time has not elapsed, the main control unit 20 determines that the customer has received the change, and causes the timer 30 to stop the timer operation (step S113). In this case, the output unit 60 does not output an alarm and stops outputting the alarm.

[0045] As described above, the main control unit 20 compares the first volume of the second sound previously detected by the sound detection unit 50 with the second volume of the second sound currently detected by the sound detection unit 50. If the second volume is lower than the first volume, the output unit 60 outputs an alarm. The mobile terminal 10 can determine that a customer has left the self-checkout without receiving their change, and by outputting an alarm, the possibility of the customer forgetting to take their change can be reduced.

[0046] The sound detection unit 50 repeatedly detects the second sound. The main control unit 20 repeatedly compares the first volume with the second volume for a preset time. This allows the mobile terminal 10 to accurately detect that a customer has left the self-checkout without receiving their change.

[0047] After the second volume remains lower than the first volume for a preset time, the output unit 60 outputs an alarm. Because there is a possibility that a customer will notice the second sound and accept the change, the mobile terminal 10 can avoid outputting an unnecessary alarm by outputting an alarm after a preset time has elapsed.

[0048] If the sound detection unit 50 stops detecting the second sound before the preset time has elapsed, the output unit 60 stops outputting the alarm. By stopping the output of the alarm when the customer receives the change, the mobile terminal 10 can avoid outputting unnecessary alarms.

[0049] <Second embodiment> An embodiment of the present disclosure will be described below with reference to the drawings. Fig. 5 shows the functional configuration of a mobile terminal 10a according to this embodiment. The mobile terminal 10a includes a processing unit 11a, which includes a main control unit 20, a timer 30, a storage unit 40, a sound detection unit 50, and an output unit 60a.

[0050] The output unit 60a includes a display 61, a display control unit 62, a speaker 63, a speaker control unit 64, a motor 65, and a motor control unit 66. The motor 65 generates vibrations to alert the customer to receive their change. The motor control unit 66 controls the motor 65.

[0051] The mobile terminal 10a executes the processes shown in Figures 3 and 4. Processes other than those described above will now be described.

[0052] In step S106, the main control unit 20 instructs the motor control unit 66 to generate a vibration indicating an alarm. The motor control unit 66 stores in advance a table in which vibration data indicating an alarm is registered. When the main control unit 20 instructs the motor control unit 66 to generate a vibration indicating an alarm, the motor control unit 66 outputs the vibration data indicating an alarm to the motor 65. The motor 65 generates a vibration based on the vibration data.

[0053] When the display 61 displays information indicating an alarm, there is a possibility that the customer will not notice the alarm because they do not look at the display 61. Furthermore, in public places, if the speaker 63 outputs an alarm sound at a loud volume, it may be a nuisance to people around the customer, so the volume of the speaker 63 may be limited. Therefore, even if the speaker 63 outputs an alarm sound when there is a lot of noise around the customer, there is a possibility that the customer will not notice the alarm sound. The mobile terminal 10a notifies the customer that change is due by vibration, so it is possible to more reliably remind the customer that they have forgotten to take their change.

[0054] <Third embodiment> An embodiment of the present disclosure will be described below with reference to the drawings. Fig. 6 shows the functional configuration of a processing device 11b of this embodiment. The processing device 11b includes a main control unit 20 (comparison unit), a sound detection unit 50b, and an output unit 60b.

[0055] The sound detection unit 50b detects a first sound that indicates the transaction of a product at a self-checkout counter and a second sound that indicates the receipt of change at the self-checkout counter, and detects the volume of the second sound. When the sound detection unit 50 detects the first sound and the second sound and then detects the second sound again, the main control unit 20 compares the first volume of the second sound previously detected by the sound detection unit 50 with the second volume of the second sound currently detected by the sound detection unit 50. If the second volume is lower than the first volume, the output unit 60b outputs an alarm.

[0056] By having the above configuration, the processor 11b can reduce the possibility of forgetting to collect change.

[0057] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-described embodiments. Various modifications that can be understood by those skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. Furthermore, each embodiment can be combined with other embodiments as appropriate.

[0058] Some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes.

[0059] (Appendix 1) a sound detection unit that detects a first sound that indicates a transaction of a product at a self-checkout register and a second sound that indicates the generation of change at the self-checkout register, and detects the volume of the second sound; a comparison unit that, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, compares a first volume of the second sound previously detected by the sound detection unit with a second volume of the second sound currently detected by the sound detection unit; an output unit that outputs an alarm when the second volume is lower than the first volume; Equipped with Processing equipment.

[0060] (Appendix 2) the sound detection unit repeatedly detects the second sound; The comparison unit repeatedly compares the first volume with the second volume for a preset time. 10. The processing device of claim 1.

[0061] (Appendix 3) After the second volume continues to be lower than the first volume for the time period, the output unit outputs the alarm. 3. The processing device of claim 2.

[0062] (Appendix 4) If the sound detection unit stops detecting the second sound before the time period has elapsed, the output unit stops outputting the alarm. 4. The processing device of claim 3.

[0063] (Appendix 5) The output unit includes a display unit that displays information indicating the warning. 5. The processing device of any one of claims 1 to 4.

[0064] (Appendix 6) The output unit includes a speaker that outputs a sound indicating the alarm. 6. The processing device of any one of appendices 1 to 5.

[0065] (Appendix 7) The output unit includes a motor that outputs a vibration indicating the alarm. 7. The processing device of any one of claims 1 to 6.

[0066] (Appendix 8) A mobile terminal comprising the processing device according to any one of Supplementary Notes 1 to 7.

[0067] (Appendix 9) a sound detection unit detecting a first sound indicating that a product is being processed at a self-checkout register and a second sound indicating that change has been provided at the self-checkout register, and detecting the volume of the second sound; a comparison unit comparing, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, a first volume of the second sound previously detected by the sound detection unit with a second volume of the second sound currently detected by the sound detection unit; an output unit outputting an alarm when the second volume is lower than the first volume; Equipped with Processing method.

[0068] (Appendix 10) the sound detection unit repeatedly detects the second sound; The comparison unit repeatedly compares the first volume with the second volume for a preset time. The processing method described in Appendix 9.

[0069] (Appendix 11) After the second volume continues to be lower than the first volume for the time period, the output unit outputs the alarm. The processing method described in Appendix 10.

[0070] (Appendix 12) and a step of, when the sound detection unit stops detecting the second sound before the time elapses, the output unit cancels output of the alarm. The processing method described in Appendix 11.

[0071] (Appendix 13) the output unit displays information indicating the warning on a display unit. 13. The method of any one of appendices 9 to 12.

[0072] (Appendix 14) The output unit outputs a sound indicating the alarm from a speaker. 14. The method of any one of appendices 9 to 13.

[0073] (Appendix 15) The output unit outputs a vibration indicating the alarm from a motor. 15. The method of any one of appendices 9 to 14.

[0074] (Appendix 16) detecting a first sound indicating that a product is being processed at a self-checkout register and a second sound indicating that change has been provided at the self-checkout register, and detecting the volume of the second sound; a step of comparing a first volume of the second sound detected previously with a second volume of the second sound detected this time when the second sound is detected again after the first sound and the second sound have been detected; outputting an alarm if the second volume is lower than the first volume; A program that causes a computer to execute the following.

[0075] (Appendix 17) repeatedly detecting the second sound; repeatedly comparing the first volume with the second volume for a preset period of time; 16. The program described in Appendix 16.

[0076] (Appendix 18) After the second volume continues to be lower than the first volume for the time period, the alarm is output. 17. The program described in Appendix 17.

[0077] (Appendix 19) and a step of ceasing output of the alarm if detection of the second sound is stopped before the time period has elapsed. 18. The program described in Appendix 18.

[0078] (Appendix 20) In the step of outputting the warning, information indicating the warning is displayed on a display unit. 20. The program of any one of appendices 16 to 19.

[0079] (Appendix 21) In the step of outputting the alarm, a sound indicating the alarm is output from a speaker. 21. The program of any one of appendices 16 to 20.

[0080] (Appendix 22) In the step of outputting the alarm, a vibration indicating the alarm is output from a motor. 22. The program of any one of appendices 16 to 21. [Explanation of symbols]

[0081] 10,10a Mobile devices 11, 11a, 11b Processing device 20 Main control unit 30 Timer 40 Storage section 50, 50a, 50b Sound detection unit 51,105 Mike 52 Microphone control section 60, 60a, 60b Output section 61,106 displays 62 Display control unit 63,107 speakers 64 Speaker control unit 65 motor 66 Motor control unit 101 CPU 102 ROM 103 RAM 104 Storage device

Claims

1. a sound detection unit that detects a first sound that indicates a transaction for a product at a self-checkout register and a second sound that indicates the receipt of change at the self-checkout register, and detects the volume of the second sound; a comparison unit that, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, compares a first volume of the second sound previously detected by the sound detection unit with a second volume of the second sound currently detected by the sound detection unit; an output unit that outputs a warning when the second volume is smaller than the first volume; Equipped with Processing equipment.

2. the sound detection unit repeatedly detects the second sound; the comparison unit repeatedly compares the first volume with the second volume for a preset time period; The processing device of claim 1 .

3. and after the second volume has remained lower than the first volume for the period of time, the output unit outputs the warning. The processing device of claim 2 .

4. If the sound detection unit stops detecting the second sound before the time period has elapsed, the output unit stops outputting the alarm. The processing device according to claim 3 .

5. The output unit includes a display unit that displays information indicating the warning. The processing device according to claim 1 or 2.

6. The output unit includes a speaker that outputs a sound indicating the alarm. The processing device according to claim 1 or 2.

7. The output unit includes a motor that outputs a vibration indicating the alarm. The processing device according to claim 1 or 2.

8. A mobile terminal comprising the processing device according to claim 1 or 2.

9. a sound detection unit detecting a first sound of a product being processed at a self-checkout register and a second sound of change being provided at the self-checkout register, and detecting the volume of the second sound; a comparison unit comparing, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, a first volume of the second sound previously detected by the sound detection unit with a second volume of the second sound currently detected by the sound detection unit; an output unit outputting an alarm when the second volume is smaller than the first volume; Equipped with Processing method.

10. detecting a first sound indicating that a product is being processed at a self-checkout register and a second sound indicating that change has been provided at the self-checkout register, and detecting the volume of the second sound; a step of comparing, when the second sound is detected again after the first sound and the second sound have been detected, a first volume of the second sound detected previously with a second volume of the second sound detected this time; outputting an alarm if the second volume is lower than the first volume; A program that causes a computer to execute the following.

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