The invention discloses a driving assistance system and method, belonging to the field of automobile electronic technology. The assistance system comprises a server and a vehicular terminal in communication connection with the server, wherein the vehicular terminal is used for acquiring to-be-monitored data and sending the to-be-monitored data to the server; the to-be-monitored data refers to the parameters of the traveling vehicle; the server is used for receiving the to-be-monitored data and judging whether the passenger in the vehicle performs bad driving behavior according to the to-be-monitored data; the server is also used for sending guidance data corresponding to the bad driving behavior to the vehicular terminal if the passenger in the vehicle performs bad driving behavior, and the guidance data is used for guiding the passenger to drive regularly; and the vehicular terminal is also used for showing the guidance data to the passenger. In the invention, the guidance data is fed back to the passenger in time when the passenger in the vehicle performs bad driving behavior so as to remind the passenger to drive safely, thus the probability of accident caused by bad driving behavior of the passenger is reduced, and the safety of the vehicle driving by the passenger is improved.