A diversity antenna apparatus has N (N is 3 or more integer) elements of antennas which receive radio signals, a priority storage unit configured to store priority data of the N elements of antennas, a first antenna selector which selects two antennas from among the N elements of antennas based on the priority data, a second antenna selector which selects one of the selected two antennas based on a prescribed condition, and a priority update unit configured to update priority data of the N elements of antennas stored in the priority storage unit based on the antenna selected by the second antenna selector.