Alarm system, alarm method, and recording medium

An alarm method comprising:

• detecting, by a reading device installed in a store, a position of a price label tag attached to a product and including a first RFID tag that stores product identification information of the product and a position of a spare tag attached to the product and including a second RFID tag;
• determining whether the position of the price label tag and the position of the spare tag match;
• and
• issuing an alarm in a case where the position of the price label tag and the position of the spare tag do not match.

A non-transitory computer-readable recording medium storing a program for causing a computer to execute processing of:

• detecting, by a reading device installed in a store, a position of a price label tag attached to a product and including a first RFID tag that stores product identification information of the product and a position of a spare tag attached to the product and including a second RFID tag;
• determining whether the position of the price label tag matches the position of the spare tag;
• and
• issuing an alarm in a case where the position of the price label tag and the position of the spare tag do not match.