Abstract: A data input display system makes it possible to input data which have a document structure having constraint in disposition of constituent elements. Such a structure is used in mathematical formulae, chemical formulae, and other data which have grammar and notations. The data input display system allows this type of data to be entered with a same level of ease and simplicity as the input of ordinary characters, and can ensure correct display and synthetic correctness of an input document; the system automatically configures the data on the display screen, based upon an integrated input, construction, and configuration process.