A driver assistance apparatus comprising: a sensing unit configured to: - acquire information regarding a first other vehicle being driven in the vicinity of a vehicle (1, 1401) and regarding a driver of the vehicle (1, 1401), and - acquire an image of a space inside the vehicle (1, 1401) including the driver of the vehicle; and a processor connected to the sensing unit and configured to: - detect a gaze and pupils of the driver based on the image of the driver acquired by the sensing unit, - judge a state of the driver based on a size of the pupils of the driver when the driver's gaze is directed to the first other vehicle, - receive, via inter-vehicular communication, communication information regarding the first other vehicle from a second other vehicle being driven in the vicinity of the vehicle (1, 1401), - judge whether the first other vehicle is a dangerous vehicle based on the state of the driver, the information regarding the first other vehicle, and the communication information regarding the first other vehicle, wherein the dangerous vehicle is a vehicle that has a likelihood of colliding with the vehicle (1, 1401) or that is an obstacle to a normal driving of the vehicle (1, 1402), and execute at least one predetermined operation changing the driving state of the vehicle (1, 1401) by executing at least one of a steering control, an acceleration control, or a speed reduction control based on judging that the first other vehicle is the dangerous vehicle. a sensing unit configured to: - acquire information regarding a first other vehicle being driven in the vicinity of a vehicle (1, 1401) and regarding a driver of the vehicle (1, 1401), and - acquire an image of a space inside the vehicle (1, 1401) including the driver of the vehicle; and - acquire information regarding a first other vehicle being driven in the vicinity of a vehicle (1, 1401) and regarding a driver of the vehicle (1, 1401), and - acquire an image of a space inside the vehicle (1, 1401) including the driver of the vehicle; and a processor connected to the sensing unit and configured to: - detect a gaze and pupils of the driver based on the image of the driver acquired by the sensing unit, - judge a state of the driver based on a size of the pupils of the driver when the driver's gaze is directed to the first other vehicle, - receive, via inter-vehicular communication, communication information regarding the first other vehicle from a second other vehicle being driven in the vicinity of the vehicle (1, 1401), - judge whether the first other vehicle is a dangerous vehicle based on the state of the driver, the information regarding the first other vehicle, and the communication information regarding the first other vehicle, wherein the dangerous vehicle is a vehicle that has a likelihood of colliding with the vehicle (1, 1401) or that is an obstacle to a normal driving of the vehicle (1, 1402), and - detect a gaze and pupils of the driver based on the image of the driver acquired by the sensing unit, - judge a state of the driver based on a size of the pupils of the driver when the driver's gaze is directed to the first other vehicle, - receive, via inter-vehicular communication, communication information regarding the first other vehicle from a second other vehicle being driven in the vicinity of the vehicle (1, 1401), - judge whether the first other vehicle is a dangerous vehicle based on the state of the driver, the information regarding the first other vehicle, and the communication information regarding the first other vehicle, wherein the dangerous vehicle is a vehicle that has a likelihood of colliding with the vehicle (1, 1401) or that is an obstacle to a normal driving of the vehicle (1, 1402), and execute at least one predetermined operation changing the driving state of the vehicle (1, 1401) by executing at least one of a steering control, an acceleration control, or a speed reduction control based on judging that the first other vehicle is the dangerous vehicle.