An input/output control system of an information processing apparatus that includes a first storage area and a second storage area and carries out an input/output processing using a part or whole of the first storage area as a cache. The input/output control system includes: a cache managing unit 110 storing data, which is inputted from or outputted to the second storage area, in a third storage area used as a cache of the first storage area; an input/output specification information storage unit 111 correlating a data area, which is an area of the data stored in the third storage area, and information with regard to the input/output to store them; a write-back unit 120 generating an output request of the data from the data area in the third storage area to the second storage area; and an input/output specifying unit 100 specifying the information with regard to the input/output correlated to the data area of the data which is a target for the generated output request, by referring to the input/output specification information storage unit.