Driving assistance device, vehicle, method, and computer readable storage medium

An in-vehicle driving assistance device comprising:

• at least one processor circuit with a memory comprising instructions that, when executed by the processor circuit, cause the at least one processor circuit to at least:
• decide whether or not to use a driving assistance function based on a travel environment of a vehicle;
• notify a driver of the vehicle of a guidance recommending use of the driving assistance function in a case when the driving assistance function is decided to be usable;
• record a reaction from the driver to the notification as a reaction history;
• receive an operation input from the driver to the notification;
• and
• determine execution or suppression of the notification based on the reaction history recorded,
• wherein the recording further comprises:
• cumulatively measuring the operation input as a first value in a case where the operation input received indicates determination of use of the driving assistance function,
• cumulatively measuring the operation input as a second value in a case where the operation input received indicating determination of non-use of the driving assistance function, and
• recording the first value and the second value as a reaction history, and
• the determining determines the execution or suppression of the notification based on a comparison result between the first value and the second value.