1. An information processing system comprising: an execution unit; a first cache memory having entries accessible by a logical address; a second cache memory having entries accessible by a physical address; a first address array coupled to said execution unit and said first cache memory and having a logical address area defined by a logical address; and a second address array coupled to said execution unit and said second cache memory and having a physical address area defined by a physical address and a tag area storing translation information for translating the physical address into a logical address.