An apparatus for providing a notification for transferring control authority for a vehicle to a driver of the vehicle while autonomous driving is performed, the apparatus comprising: a speaker configured to output a sound notification; a vibration motor configured to output a vibration notification; and a control circuit electrically connected to the speaker and the vibration motor, wherein the control circuit is configured to: when a situation to hand over the control authority for the vehicle to the driver of the vehicle occurs, output a first notification using the speaker during a first time interval; characterized in that the control circuit is configured to: output a second notification using the speaker and the vibration motor during a second time interval, when the control authority is not handed over to the driver of the vehicle, after the first time interval elapses; and output a third notification using the speaker and the vibration motor during a third time interval, when the control authority is not handed over to the driver of the vehicle, after the second time interval elapses, wherein: the sound notification in the second notification is greater in frequency or in intensity than the sound notification in the first notification, the sound notification in the third notification is greater in frequency or in intensity than the sound notification in the second notification, and the vibration notification in the third notification is greater in intensity than the vibration notification in the second notification, wherein the control circuit is configured to: adjust a length of at least one of the first time interval, the second time interval, or the third time interval based on at least one of the speed of the vehicle, traffic in a road where the vehicle is traveling, or a lane recognizing quality value when the situation to hand over the control authority for the vehicle to the driver of the vehicle occurs. a speaker configured to output a sound notification; a vibration motor configured to output a vibration notification; and a control circuit electrically connected to the speaker and the vibration motor, wherein the control circuit is configured to: when a situation to hand over the control authority for the vehicle to the driver of the vehicle occurs, output a first notification using the speaker during a first time interval; characterized in that the control circuit is configured to: output a second notification using the speaker and the vibration motor during a second time interval, when the control authority is not handed over to the driver of the vehicle, after the first time interval elapses; and output a third notification using the speaker and the vibration motor during a third time interval, when the control authority is not handed over to the driver of the vehicle, after the second time interval elapses, when a situation to hand over the control authority for the vehicle to the driver of the vehicle occurs, output a first notification using the speaker during a first time interval; characterized in that the control circuit is configured to: output a second notification using the speaker and the vibration motor during a second time interval, when the control authority is not handed over to the driver of the vehicle, after the first time interval elapses; and output a third notification using the speaker and the vibration motor during a third time interval, when the control authority is not handed over to the driver of the vehicle, after the second time interval elapses, output a second notification using the speaker and the vibration motor during a second time interval, when the control authority is not handed over to the driver of the vehicle, after the first time interval elapses; and output a third notification using the speaker and the vibration motor during a third time interval, when the control authority is not handed over to the driver of the vehicle, after the second time interval elapses, wherein: the sound notification in the second notification is greater in frequency or in intensity than the sound notification in the first notification, the sound notification in the third notification is greater in frequency or in intensity than the sound notification in the second notification, and the vibration notification in the third notification is greater in intensity than the vibration notification in the second notification, wherein the control circuit is configured to: adjust a length of at least one of the first time interval, the second time interval, or the third time interval based on at least one of the speed of the vehicle, traffic in a road where the vehicle is traveling, or a lane recognizing quality value when the situation to hand over the control authority for the vehicle to the driver of the vehicle occurs. the sound notification in the second notification is greater in frequency or in intensity than the sound notification in the first notification, the sound notification in the third notification is greater in frequency or in intensity than the sound notification in the second notification, and the vibration notification in the third notification is greater in intensity than the vibration notification in the second notification, wherein the control circuit is configured to: adjust a length of at least one of the first time interval, the second time interval, or the third time interval based on at least one of the speed of the vehicle, traffic in a road where the vehicle is traveling, or a lane recognizing quality value when the situation to hand over the control authority for the vehicle to the driver of the vehicle occurs.