Driver assistance system and driver assistance method

A driver assistance system comprising:

• a detector configured to detect wakefulness reduction of a driver or absent-minded driving by the driver;
• a navigator configured to navigate a vehicle based on map information;
• a stimulator configured to continuously or intermittently apply stimulation to the driver;
• and
• a voice interactor configured to interact with the driver by voice,
• wherein:
• the navigator is configured to automatically search for a resting facility on a route from the map information in response to a detection of the wakefulness reduction or the absent-minded driving;
• and
• the voice interactor is configured to automatically execute a first interaction of proposing navigation to the resting facility by the navigator in response to the detection of the wakefulness reduction or the absent-minded driving, and automatically execute a second interaction of proposing application of stimulation by the stimulator after an execution of the first interaction and during a period until the vehicle arrives at the resting facility;
• wherein the voice interactor is configured to stop the execution of the first interaction and execute the second interaction in response to the vehicle being caught in a traffic jam.