Anti-collision method for radio frequency identification readers and radio frequency identification reader

A method for preventing collision between RFID readers in a multiple reader-tag system and an RFID reader are provided to reduce poser consumption of the reader and solve a problem about collision between readers without the hardware change of a tag. Information is switched by periodically receiving and transmitting announcement signal between readers within communication distance. A first reader which it preferentially reads tags is determined. The first reader reads the tag. A second reader is determined in order for the first reader to read the tags based on the announcement signal.