Non-contact ic medium communication device

A method of non-contact IC medium communication, comprising the steps of:

• obtaining, from each of separate read areas, identification information of a non-contact IC medium that exists within the read area and a signal level of a reception signal received from the non-contact IC medium, the identification information and the signal level being associated with each other;
• performing difference operation or division with respect to respective signal levels of reception signals from the separate read areas, for each of the identification information, to obtain a composite signal level;
• and
• extracting the identification information whose composite signal level falls within a predetermined threshold range.

A computer-readable storage medium storing a non-contact IC medium communication program for causing a computer to perform:

• a receiving process of obtaining, from each of separate read areas, identification information of a non-contact IC medium that exists within the read area and a signal level of a reception signal received from the non-contact IC medium, the identification information and the signal level being associated with each other;
• an operating process of performing difference operation or division with respect to respective signal levels of reception signals from the separate read areas, for each of the identification information, to obtain a composite signal level;
• and
• an extracting process of extracting the identification information whose composite signal level falls within a predetermined threshold range.