A control apparatus which controls an image sensing apparatus, includes a determination unit, a command generating unit and a command sending unit. The determination unit determines whether or not verification data has been added to an image file, the verification data being used to determine whether or not a digital image in the image file has been altered. The command generating unit generates a command that requests the image sensing apparatus to change the contents of the image file. The command sending unit sends the command to the image sensing apparatus if the determination unit determines that the verification data has not been added to the image file, the command being not sent to the image sensing apparatus if the determination unit determines that the verification data has been added to the image file.