To run the total capability in conjunction, without mounting a function for indicating the total capability of the other image processing apparatus performing image processing on one image processing apparatus side, in an operation terminal connected with a plurality of image processing apparatus over a network.

An operation terminal includes image processing apparatus capability inquiry means 122 for inquiring the capability of an image processing apparatus, image processing apparatus selection means 125 for selecting an image processing apparatus having the capability required for image processing, and image processing apparatus capability indication means 124 for indicating the capability inquired on an operation panel along with an image processing apparatus thus selected. Operation of the image processing is instructed to the image processing apparatus thus selected, in response to user's operation.