A control unit in an image processing apparatus performs control as follows. The storage unit stores image data in a first format and image data in a second format for a particular application, into which the image data in the first format is converted by the converting unit, at image input. When the image data is to be used by a first application which is same as the particular application in a first apparatus of the same model as the image processing apparatus, a communication unit transfers the stored image data in the second format to the first apparatus. When the image data is to be used by a second application different from the particular application, the communication unit transfers image data in a format for the second application, into which the converting unit converts the stored image data in the first format, to the first apparatus.