Radio communication apparatus and method thereof

A radio communication device, comprising:

• RF-tag inquiry unit which inquires for tag-identification information to an RF-tag;
• radio field intensity detecting unit which detects a radio field intensity of a response radiowave returned from the RF-tag;
• radio field intensity determining unit which determines whether or not a radio field intensity is equal to or greater than a threshold;
• execution control unit which executes a prescribed process for an RF-tag, a radio field intensity of a response radiowave of which has been determined to be equal to or greater than the threshold by the radio field intensity determining unit;
• first radio field intensity determining unit which determines a first radio field intensity using a radio field intensity of a response radiowave returned from an RF-tag that is determined to be an object RF-tag for which the prescribed processing is executed;
• second radio field intensity determining unit which determines a second radio field intensity using the radio field intensity of a response radiowave returned from the RF tag that has been determined to be a non-object RF-tag for which the prescribed processing is not executed;
• and
• threshold update unit which calculates a new threshold using the first radio field intensity and the second radio field intensity, and updating a current threshold with the new threshold.