1. A computer implemented method for developing an ontology ( 70 ) of a text ( 10 ) in natural language, comprising the steps of: receiving text data from text ( 10 ); a grammatical analyzer extracting, by a computer, syntax and meaningful words ( 20 ) from the text via a grammatical analysis (S 100 ) of the received text data; for each of at least some of the meaningful words ( 20 ) of the text: searching (S 200 ) for a definition ( 40 ) of the meaningful word ( 20 ) by means of at least one electronic dictionary ( 30 , 35 ), the grammatical analyzer extracting syntax and meaningful words of the definition, and creating (S 300 ) an elementary lexical graph ( 50 ) of the definition based on the syntax and the meaningful words of the definition; and merging (S 400 ), by the computer, at least two of the elementary lexical graphs ( 50 ) created, as a function of the syntax of the text, so as to create at least one semantic graph ( 60 ) of the text.
1. A computer implemented method for developing an ontology ( 70 ) of a text ( 10 ) in natural language, comprising the steps of: receiving text data from text ( 10 ); a grammatical analyzer extracting, by a computer, syntax and meaningful words ( 20 ) from the text via a grammatical analysis (S 100 ) of the received text data; for each of at least some of the meaningful words ( 20 ) of the text: searching (S 200 ) for a definition ( 40 ) of the meaningful word ( 20 ) by means of at least one electronic dictionary ( 30 , 35 ), the grammatical analyzer extracting syntax and meaningful words of the definition, and creating (S 300 ) an elementary lexical graph ( 50 ) of the definition based on the syntax and the meaningful words of the definition; and merging (S 400 ), by the computer, at least two of the elementary lexical graphs ( 50 ) created, as a function of the syntax of the text, so as to create at least one semantic graph ( 60 ) of the text. 2. The method according to claim 1 , further comprising a step, before the merging step (S 400 ), of extracting relations between the meaningful words of the text based on the syntax and the meaningful words of the text that have been extracted via the grammatical analysis, the merging step being based on these relations between meaningful words of the text.