DATA PROCESSING SYSTEM UTILIZING DISCRETE OPERATING DEVICE

Interface screen 30 is displayed on display 3 of data processing system 1; interface screen 30 is a composite screen of an interface screen of open Layer L1 on which data processing operations are available for general use, and an interface screen of closed layer L2 to which access is restricted to designated users. Identification data ID transmitted from pen-form operating device 2 is received in receiving part 15 of data processing system 1. When a position is selected by contacting an area on touch panel 3b with an operating device, the contacted position is detected by touch panel 3b. CPU 10 determines whether identification data ID stored in ROM 12 is received. CPU 10, on the basis of this determination result, selects both or either of layers L1 and/or L2. When a position is detected by touch panel 3b, CPU 10 executes a data processing operation corresponding to a detected position on selected layer(s). Accordingly, it is possible to easily and effectively restrict, on a user basis, access to operations within a restricted data layer.