1. A virtualization system comprising: a virtualizing unit for activating a virtual machine to which identification information identifying the virtual machine is assigned and which is capable of executing a predetermined function; a plurality of virtual machines activated by the virtualizing unit; and a correspondence table creating unit for creating a function correspondence table in which the identification information assigned to each of the virtual machines is associated with a function to be executed by the virtual machine among functions that can be executed by the virtual machines, wherein the virtual machine specifies an associated function in the function correspondence table on a basis of the identification information assigned to the virtual machine, and executes the specified function.