A method for processing in 2-area enlargement display with high operability through touch operations. Upon a move operation in a horizontal direction while in contact with a display unit, if the first and the second imaging areas respectively corresponding to ranges displayed in a first and a second display area in the 2-area enlargement display are separated from each other, control is performed to change a position of the first imaging area and not to change a position of the second imaging area in response to the move operation. Upon the move operation in the horizontal direction, if the second imaging area adjoins the first imaging area in a direction in which the first imaging area is to be moved by the move operation, control is performed to change the positions of the first and the second imaging areas in response to the move operation.