Information Processing Method, Non-Transitory Computer-Readable Recording Medium, Radio Frequency Identifier Reader, and Information Processing System

An information processing system comprising:

• an RFID reader having a first control unit;
• and
• a server computer storing information read by the RFID reader,
• wherein the first control unit
• each time when the RFID reader reads a code of an RF tag, stores a read code of the RF tag in association with a date/time when reading is performed and a work attribute, and
• transmits a stored code of each RF tag, a stored date/time, and a stored work attribute to the server computer,
• wherein the server computer has a second control unit, and
• wherein the second control unit:
• receives the code of each RF tag, the date/time, and the work attribute transmitted by the first control unit, and
• stores the code of each RF tag received in association with the date/time and the work attribute.