An image processing apparatus, an image processing system, and a method thereof are provided. The apparatus includes: a signal processor which receives a plurality of contents and constructs image frames of the respective contents; an outputter which operates in a first mode to output image frames of only one content, and in a second mode to combine and output the image frames of the plurality of contents; a video telephony processor including an image capturer to capture an image external to the apparatus, the video telephony processor connecting video telephony, if a request for video telephony is received via an external network; and a controller which controls the outputter to determine a combination of the image frames of the plurality of contents outputted through the signal processor, according to an operational status of the video telephony processor.