This invention provides an image capturing apparatus having an interface for connecting with a device including a programmable integrated circuit, and a storage unit for storing configuration data of the programmable integrated circuit, wherein the apparatus comprises an updating unit which updates the configuration data of the storage unit of the device via interface; and a determining unit which determines whether the updating is completed by the updating unit, wherein the updating unit writes, via the interface, the configuration data to the storage unit by issuing a updating request to the device and transferring the configuration data, and receives, via the interface, the configuration data by issuing a readout request to the device, wherein the determining unit determines whether the updating is completed by determining whether the received configuration data matches the written configuration data.