An image processing apparatus comprises a communication unit configured to communicate with an external apparatus, an image processing unit configured to perform first image processing on first image data, and a control unit configured to transmit a request for executing second image processing which is different from the first image processing on the first image data to the external apparatus via the communication unit, and receive second image data on which the second image processing has been executed from the external apparatus via the communication unit. In response that a function of the second image processing executable in the external apparatus is updated, the control unit determines whether to transmit a request again for executing the second image processing to the external apparatus.