| CPC G07G 1/01 (2013.01) [G06Q 20/202 (2013.01); G07G 1/12 (2013.01)] | 15 Claims |

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1. A non-transitory computer-readable storage program storing computer readable instructions thereon which, when executed by a computer, cause the computer to perform a method, the method comprising:
receiving identification information identifying the product;
receiving, from a first party, input relating to payment for a product;
displaying an image of an effect corresponding to the input relating to payment on a transparent display medium disposed so as to separate the first party from a second party who is purchasing the product, wherein the transparent display medium is a transparent material such that the first party and the second party can recognize each other's faces through the transparent display medium, wherein the image of the effect corresponds to the shopping experience of the second party during payment;
determining whether or not a total amount for the products for which input of the identification information has been received is below a predetermined amount, and in a case that the total amount is below the predetermined amount, displaying an image on the transparent display medium indicating that the total amount is below the predetermined amount, and displaying an image on the transparent display medium introducing a product with which the predetermined amount is reached; and
controlling communication between a point of sale (POS) terminal and a display device that includes the transparent display medium and a projection device, wherein the projection device projects the images onto the transparent display medium based on control from the POS terminal, and wherein the projection device is disposed in a position where light projected by the projection device is not emitted onto the first party or the second party.
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