The truth is that among all the automatic question answering systems, there are several fields of application: legal, medicine, etc. This is due to the fact that these professional fields are currently saturated by the great amount of technical information that is generated daily. In such a way, that even the professionals of the sector have great problems to stay updated before such torrent of generated information. If we look, for example, at the legal field. Lawyers have enormous difficulties to keep up to date with the avalanche of legislation coming from the local, regional, national and international levels. That is why legal question answering systems can help them enormously in their daily tasks.