Driving assistance device, driving assistance method, information-providing device, information-providing method, navigation device and navigation method

A driving assistance device comprising:

• a biometric information obtaining unit configured to obtain biometric information of a driver;
• a driver state estimating unit configured to estimate, on the basis of the biometric information obtained by the biometric information obtaining unit, a state of the driver at a time later than a timing of obtaining the biometric information by the biometric information obtaining unit;
• and
• a control unit configured to control driving assistance of a vehicle on the basis of a comparison of the state of the driver estimated by the driver state estimating unit with a condition for the state of the driver that is set in association with any one of a position and an environment in which the vehicle driven by the driver is predicted to travel,
• wherein the state of the driver is a concentration level of the driver;
• wherein the driver state estimating unit, on the basis of the biometric information obtained by the biometric information obtaining unit, estimates a tendency of the concentration level of the driver to decrease over time;
• and
• wherein the control unit promotes the driving assistance as a degree to which the state of the driver estimated by the driver state estimating unit does not satisfy the condition for the state of the driver that is set in association with any one of the position and the environment in which the vehicle driven by the driver is predicted to travel is greater.