An image processing apparatus performs a processing of checking periodically whether data addressed to the image processing apparatus exist in a server apparatus while suppressing power consumption as much as possible. The NIC communicates with the server apparatus to check whether a storage unit of the server apparatus stores object data for processing addressed to the image processing apparatus. An energization switching unit switches the energization (power supply) to a main controlling unit that acquires the data addressed to the image processing apparatus from the server apparatus. The NIC controls the energization switching unit to activate the main controlling unit and the printer unit on the condition that the object data for processing addressed to the image processing apparatus is present.