1. An information processor which adds or change a target object to be displayed in a first display area on a display means on which picture information is being displayed, the apparatus comprising: an operating means; an attribute processing means for outputting a plurality of sample objects having different attributes; a display control means for displaying the plurality of sample objects having different attributes, supplied from the attribute processing means, in a predetermined order in the form of a list in a second display area of a display means; and a control means for providing such a control as to add or change the target object to be displayed in the first display area of the display means on the basis of the attribute of one selected, using the operating means, from the plurality of sample objects being displayed in the second display area of the display means and having the different attributes.