An image processing apparatus comprising: a first image processing unit which includes a first memory provided in the first image processing unit and is arranged to perform a first signal processing on image data, and store the first signal processed image data in the first memory; a second image processing unit which includes a second memory provided in the second image processing unit and is arranged to perform a second signal processing and to directly access the first memory, receive the stored image data, perform the second signal processing on the received image data; and an image output unit, the apparatus characterized in that: the second image processing unit is arranged to output the image data on which the second signal processing has been performed to the image output unit, a plurality of image receiving units (210-1, 210-2), each of which receives a plurality of image data, wherein the first image processing unit is arranged to perform the first signal processing on each of the plurality of image data received from the plurality of image receiving units, and store the plurality of image data on which the first signal has been performed in each of a plurality of areas of the first memory, and wherein the second image processing unit is arranged to change an access area from among the plurality of areas of the first memory and change the image data on which the second signal processing is to be performed, when a request to change image is received from a user. a first image processing unit which includes a first memory provided in the first image processing unit and is arranged to perform a first signal processing on image data, and store the first signal processed image data in the first memory; a second image processing unit which includes a second memory provided in the second image processing unit and is arranged to perform a second signal processing and to directly access the first memory, receive the stored image data, perform the second signal processing on the received image data; and an image output unit, the apparatus characterized in that: the second image processing unit is arranged to output the image data on which the second signal processing has been performed to the image output unit, a plurality of image receiving units (210-1, 210-2), each of which receives a plurality of image data, wherein the first image processing unit is arranged to perform the first signal processing on each of the plurality of image data received from the plurality of image receiving units, and store the plurality of image data on which the first signal has been performed in each of a plurality of areas of the first memory, and wherein the second image processing unit is arranged to change an access area from among the plurality of areas of the first memory and change the image data on which the second signal processing is to be performed, when a request to change image is received from a user. the second image processing unit is arranged to output the image data on which the second signal processing has been performed to the image output unit, a plurality of image receiving units (210-1, 210-2), each of which receives a plurality of image data, wherein the first image processing unit is arranged to perform the first signal processing on each of the plurality of image data received from the plurality of image receiving units, and store the plurality of image data on which the first signal has been performed in each of a plurality of areas of the first memory, and wherein the second image processing unit is arranged to change an access area from among the plurality of areas of the first memory and change the image data on which the second signal processing is to be performed, when a request to change image is received from a user.