An image processing apparatus connectable to a terminal through a network, includes a receiver configured to receive original image data uploaded from the terminal, an image processor configured to change a tone of the original image data, a transmitter which transmits tone-changed image data output from the image processor to the terminal, and a face detector configured to detect a face region in the original image data received by the receiver, wherein the image processor is configured to perform a first tone-change for image data of the face region in the original image data, and perform a second tone-change for image data of another region in the original image data.