Store exit management system, store exit management method, and recording medium

A store exit management method comprising:

• acquiring a payment completion code from a portable terminal operated by a customer when a product was registered and paid for through the portable terminal;
• acquiring a quantity of a payment completion product associated with the payment completion code;
• estimating, from an image obtained by imaging goods of the customer leaving a store, a quantity of a product to be taken out by the customer;
• detecting an abnormality based on the acquired quantity of the payment completion product and the estimated quantity of the product to be taken out;
• and
• outputting information indicating that the abnormality is detected.

A recording medium that non-transiently records a program for causing a computer to execute the steps of:

• acquiring a payment completion code from a portable terminal operated by a customer when a product was registered and paid for through the portable terminal;
• acquiring a quantity of a payment completion product associated with the payment completion code;
• estimating, from an image obtained by imaging goods of the customer leaving a store, a quantity of a product to be taken out by the customer;
• detecting an abnormality based on the acquired quantity of the payment completion product and the estimated quantity of the product to be taken out;
• and
• outputting information indicating that the abnormality is detected.