Abstract: A data processor for speedier processing of input data includes a data processing system for executing a text editing process and a text printing process by the time slice method and a preference control unit for selecting between the above processes. When data is entered into the processor, the entering process or text editing process is generally preferred to the text printing process. Therefore, no delay occurs in inputting data through a keyboard from data entry to its display. If desired, it is possible to prefer the text printing process to the text editing process.

Abstract: A word processor with a merge print function which permits an insertion data file to be easily formed without troublesome operations an insertion data field can be adaptively expanded or has the capability to adaptively expand or contract an insertion data field to cope with either longer or shorter lengths of input data. The expansion or contraction is executed either manually by a specific key operation, or automatically according to the data length.

Abstract: In a data processing device such as a word processor comprising input means for inputting character data and format data, display means for displaying the input data on a screen, and means for processing the input data and displaying the processed data on the display means, the screen on the display means is separated into a line format area for displaying line format data and other area for displaying the other, and the processing device is provided with means for shifting the data displayed on the line format area relative to the data displayed on the other area.