Sales management system and sales management method

A sales management method for a sales management system that manages a purchased product of a purchaser who comes into a store, the sales management system including a sensor that outputs detected data on a motion of the purchaser and a movement of a product from a display area of the product in a store, and a memory that stores a purchased product list and an unidentified product list in association with the purchaser who comes into the store, the purchased product list being a list of an identification code of a product identified as having been taken out of the display area by the associated purchaser, the unidentified product list being a list of an identification code of a product that is not identified as having been taken out of the display area but may have been taken out of the display area by the associated purchaser, the sales management method comprising:

• monitoring the motion of the purchaser and the movement of the product from the display area on the basis of the detected data output from the sensor;
• identifying, when the product is moved from the display area, the purchaser who has taken out the product from the display area on the basis of a monitoring result;
• updating, when the purchaser is identified, the purchased product list associated with the identified purchaser, the updated purchased product list including the identification code of the product;
• determining at least one purchaser who may have taken out the product from the display area on the basis of the monitoring result;
• and
• updating, when the purchaser fails to be identified, the unidentified product list associated with the determined at least one purchaser, the updated unidentified product list including the identification code of the product.