The display unit displays an "Author" window and other windows that form a CUI according to control by the display control unit. The input operation unit receives inputs from the editor who views the "Author" and other windows. The window information storage unit stores the attributes of windows displayed by the display unit. The script information storage unit stores a template of scripts, including parameter strings, which conforms to the standards for multimedia optical discs and which is to be used for generating the outputted strings. The control unit interprets the operations received by the input operation unit 1501 and instructs the display control unit to display windows as required, in addition to storing variables that correspond to the parameters in the input data storage unit. The reproduction control information generation unit reads the data stored in the input data storage unit, uses the read data to set the parameters in the template stored in the script information storage unit, and outputs scripts for the system stream reproduction control information.