1. An asymmetric or loosely coupled multiprocessing system comprising: a storage part configured by a master central processing unit (CPU) to store to memory, a first operating system (OS) task set that is constituted by a combination of a first task and a first OS corresponding to the first task, the first task being designated by an execution instruction; and a task executing part configured by a slave CPU, that refers to the first OS task set stored to the memory, loads an OS constituting the first OS task set, and executes the first task designated by the execution instruction, wherein the master CPU replaces the first OS task set stored to the memory with a second task set constituted by a second task and an OS corresponding to the second task, when the first task executed by the slave CPU is changed.