1. An information processing apparatus comprising: a memory that stores a process identifier for identifying a process uniquely, a virtual address which is an address of a memory space available in the process, a physical address corresponding to the virtual address, and a continuous memory capacity assigned to the process so as to be associated with each other; and a memory capacity setting section that, when changing a process to an executable state, sets the continuous memory capacity to be stored in the memory, wherein the memory capacity setting section determines the continuous memory capacity based on: a memory capacity that the process requires; a memory capacity of an unused continuous region in a physical memory; and a memory capacity based on restriction of memory size dependent on a central processing unit in a computer.