To provide a system and a method that collect a performance time such as a working time without burdening a worker with a new operation by using an RFID tag.

Workers subject to performance time collection each carry the RFID tag, and RFID readers/writers are installed near working spaces subject to performance time collection. The worker places the RFID tag near the RFID reader/writer when starting work and collects the RFID tag when finishing work, so that the RFID tag stores work performance in work units. A nonvolatile memory built in the RFID tag has a storage area 111 for worker identification information and also a plurality of storage areas for storing in work units time information 113 including RFID reader/writer identification information 114 indicating the working space, a work starting time 115 and a work finishing time 116, and further has a storage address storage area 112 for storing the storage address of a current time information storage area.