To intensively display/manage data inputted/outputted to/from plural input/output screens in accordance with a purpose and to obtain immediate similarity in all the input/output screens in a system on input/output data by installing a common input/output screen realizing common immediate put/output on an input/output data regular display screen and a data intensive display screen by individual categories.

When data are inputted/outputted for systems C1, C2 and C3 and derived input/output screens 13 positioned in the lowest layer of a hierarchical structure T are intensively displayed and managed, for example, a data intensive display screen by individual categories 30, which intensively displays and manages data inputted/outputted as arbitrary category in respective input/ output screens, is arranged on a system apart from an input/output data regular display screen 10 in terms of concept. Furthermore, a common input/output screen 20 which exists between the screens, systematically connects the screens and immediately inputs/outputs the screens in common is arranged on the system.