An image processing apparatus includes a memory, an auxiliary storage used as a virtual memory together with the memory, and a hardware processor. The hardware processor determines whether or not a predetermined region set in the memory has a free space corresponding to a size of a necessary region to be reserved for execution of a specific application. When determining that the predetermined region does not have the free space, the hardware processor applies a first power-saving mode as a power-saving mode of the auxiliary storage. When determining that the predetermined region has the free space, the hardware processor applies, as the power-saving mode of the auxiliary storage, a second power-saving mode in which less power is consumed than in the first power-saving mode.