Image processing apparatus for synthesizing different input data without using hard copy

An image processing apparatus includes a plurality of input units for supplying a plurality of input data of different image information, a first selecting part for selecting one of the plurality of input units, a first memory for storing input data supplied from the selected input unit, a first display part for displaying the input data stored in the first memory, a processing part for processing input data in the first memory so that processed data is produced, a second memory for storing the processed data, the stored data having less than a one-page storage size, a second display part for displaying the processed data stored in the second memory, a plurality of output units each of which records or outputs the processed data to an external medium, a second selecting part for selecting one of the plurality of output units, and a control part for repeating the selection of one input unit and the storing of input data in the first memory so that two or more pieces of processed data are produced, and for allowing the pieces of processed data to be stored in the second memory so that a composite image is supplied to the selected output unit.