Settlement device and program

A settlement method for a settlement device, comprising:

• reading a purchase target commodity;
• performing settlement processing of the read commodity for one transaction;
• imaging a placing region where an article is placed;
• and
• comparing, among acquired images, a first image before the reading of the commodity for the one transaction and a second image at a completion time of the settlement processing and informing if both the images are different from each other.

A self-service checkout device, comprising:

• a reading component that reads a purchase target commodity;
• a settling component configured to perform settlement processing for the commodity for one transaction read by the reading component;
• a placing region configured to receive an article;
• an imaging component that images the placing region;
• and
• an informing component that compares, among images acquired by the imaging component, a first image before the reading of the commodity for the one transaction and a second image at a completion time of the settlement processing and inform if both the images are different from each other.