A handheld, mobile personal communicator 10 has a user interface comprising a touchscreen display 28. The communicator 10 also has an editing function. In an editor mode, a first screen 150 is displayed containing a limited data entry area 152 and a full keyboard 156. By selecting a predetermined key, the screen is changed to second screen 160 having an enlarged data display area and a collapsed keyboard having a single line of keys. The first screen 150 can be restored by selecting a predetermined key. The enlarged data display area 162 shows more lines of text and allows a user to readily select different portions of the document being edited.