10. A method of processing text data representing text information for guiding a user in controlling various functions of a system, said text information including a first string of text and a second string of text identical to said first string of text except for a change of format, comprising the steps of: representing said second string of text by a format change code word associated with the text data representing said first string of text in a memory; retrieving said text data from said memory including the step of converting the text data representing said first string of text to text data representing said second string of text when said format change code word is associated with said text data representing said first string of text; and generating text representative signals capable of causing the display of said text information by a display device in response to said retrieved text data.
10. A method of processing text data representing text information for guiding a user in controlling various functions of a system, said text information including a first string of text and a second string of text identical to said first string of text except for a change of format, comprising the steps of: representing said second string of text by a format change code word associated with the text data representing said first string of text in a memory; retrieving said text data from said memory including the step of converting the text data representing said first string of text to text data representing said second string of text when said format change code word is associated with said text data representing said first string of text; and generating text representative signals capable of causing the display of said text information by a display device in response to said retrieved text data. 14. The method recited in claim 10, wherein: said first string of text occurs relatively frequently within said text information and is represented by a text string representative code word which contains less bits than said text data representing said first text string; and said retrieving step includes the step of converting said text string representative code word into said text data representing said first string and converting said text string representative code word into said text data representing said second text string when said format change coded word is associated with said text string representative code word.