A data entry system using a number of different input signals provided by interacting with input means such as keys wherein to at least some of the different input signals a number of symbols including substantially all of the letters of the alphabet of one language are distributively assigned such that at least two of the letters are ambiguously assigned to at least one of the some input signals. The data entry system includes a database of words and uses a word predictive system such that in order to enter a word of the database the user provides a first input information consisting of providing the input signals corresponding to the characters, generally the letters, of the word, and an additional input information corresponding to at least one of the characters of the word and its corresponding input signal provided through the first input information, and wherein the system precisely recognizes the character among the ambiguous characters assigned to the input signal and provides a word of the dictionary that corresponds to the first and the additional input information.