1. An information processing apparatus comprising: a main memory that stores data; a plurality of processors each provided with a primary cache memory; a secondary cache memory that is provided between the main memory and the processors, the secondary cache memory having larger capacity than the primary cache memory; and a cache controller that performs cache search on the secondary cache memory based on a second index uniquely generated by joining: 1) a bit string having a predetermined bit length; and 2) a first index that is included in a data access command transmitted from any one of the processors, the first index being used for performing cache search on the primary cache memory.