1. An information processing apparatus comprising: a memory that stores (i) a process identifier for identifying a process uniquely, (ii) a virtual address, in a virtual memory space, assigned to the process, (iii) a physical address, in a physical memory, corresponding to the virtual address, and (iv) a continuous memory capacity assigned to the process, in association with each other; and a memory capacity determining section that, when changing the process to an executable state, determines the continuous memory capacity to be stored in the memory, wherein the memory capacity determining section determines the continuous memory capacity based on: a first memory capacity that the process requires; a second memory capacity of an unused continuous region in the physical memory; and a third memory capacity based on restriction of memory size of the memory dependent on a central processing unit in a computer.