1. A method controlling an apparatus, the method comprising the steps of: generating an emotional state indicator value by performing stress analysis on received user speech; comparing said emotional state indicator value to a first threshold to determine if said emotional state indicator value is above said first threshold; comparing said emotional state indicator value to a second threshold to determine if said emotional state indictor value is below said second threshold; and modifying a user interface in response to determining that said emotional state indicator value is above said first threshold or below said second threshold.