According to an embodiment of the present invention, a warning may be output along with deduction of a preset number of the reference point due to abnormal driving behavior, which will be described with reference to FIG. 2.

FIG. 2 is a flowchart showing an example of a warning output procedure according to an embodiment of the present invention.

Referring to FIG. 2, when a vehicle begins to be driven as being turned on, the reference point management unit 130 may set a reference point (S210). Here, the reference point may comply with a preset value.

During driving, when the point-deduction behavior detection unit 140 detects a point-deduction behavior (S220), a point corresponding to the detected point-deduction behavior may be deducted from the reference point (S230). In this case, the deducted points may be smaller than the reference point.

When point deduction is accumulated and the reference point reaches or falls below 0 (S240), an alert may be issued (S250). For example, when a preset reference point is 5 and a deducted point for each point-deduction behavior is 1, the alert may be issued upon accumulation of five instances of point-deduction behaviors.