Disclosed herein is a memory controlling device including: an address converting section configured to convert a logical address included in a request issued from a plurality of clients into a physical address of a memory; a request dividing section configured to divide a converted request converted by the address converting section by a command unit for the memory on a basis of the physical address of the converted request; and an arbitrating section configured to perform arbitration on a basis of the physical address indicated in a divided request output from the request dividing section.