PURPOSE: To contrive the simplification of the input processing by adding a display data again from a re-display data storage file in displaying the screen so as to display the data entered precedingly again, thereby applying reinput of different input data only.

CONSTITUTION: A screen registration means 7 registers a picture into a picture library 8. When the user applies screen display command to the system, a picture data read means 2 uses a screen name as a key to read the picture data from the library 8. Then a re-display data read means 3 uses the screen name as a key to retrieve a re-display data storage file 1 and reads it from the file 1 when the re-display data are available. Then the re-display data 9 adds the picture data for the re-display data. A screen display means 4 displays the generated picture data on a terminal display equipment 10. The input data reception means 5 receives the input data and it is stored in the file 1 by an input data storage means 5 and the next interactive processing is transferred.