Rfid system and information processing method

A radio frequency identification (RFID) system, comprising:

• a display device;
• a first communication device, communicating with a first radio frequency (RF) tag, which moves, in a non-contact manner;
• and
• a second communication device communicating with the first RF tag in a non-contact manner,
• wherein the first communication device and the second communication device repetitively output communication signals and measure a reception level of a first signal transmitted from the first RF tag based on the communication signals,
• and the RFID system comprises:
• a memory part, storing first chronological data representing the reception level of the first signal received by the first communication device in a predetermined measurement period and second chronological data representing the reception level of the first signal received by the second communication device in the measurement period;
• a generating part, specifying a higher reception level of the reception level of the first signal at the first communication device and the reception level of the first signal at the second communication device corresponding to an elapsed time from a start time of the measurement period in the first chronological data and the second chronological data at every elapsed time from the start time and generating third chronological data representing the specified reception level;
• and
• a display control part, selectively displaying at least one of a first image based on the first chronological data, a second image based on the second chronological data, and a third image based on the third chronological data on the display device or displaying the first image, the second image, and the third image on the display device at the same time.