Store system, reading apparatus, and sales registration apparatus

A store system comprising:

• a memory in which product identification data assigned respectively to first, second, and third products displayed in a store, and respective product names, respective unit prices, and respective images of the first, second, and third products are stored;
• a display configured to display the respective product names, the respective unit prices, and the respective images of the first and second products in response to a determination that the respective images of the first and second products are similar to at least a portion of an image captured by an image capturing unit, wherein the image is input when outlines extracted from a plurality of images sequentially captured by the image capturing unit are compared with each other and a portion in which there is a change between the outlines is detected as a product;
• and
• a sales registration circuit configured to register, based on the unit price of a single one product selected from the first and second products displayed on the display, sale of the single one product.