1. An electric control unit comprising: a behavior check unit determining whether a vehicle behavior is generated by comparing the vehicle behavior with a detection condition; a drive information store unit storing information of the vehicle behavior in a memory unit drive when behavior check unit determines that the vehicle behavior is generated; a classify unit classifying the vehicle behavior into one of plurality of predetermined behavior classes, the plurality of predetermined behavior classes being arranged to classify the vehicle behavior according to a magnitude of the vehicle behavior; a count unit controlling a counter for each of the plurality of behavior classes according to classification of the vehicle behavior by the classify unit; and a condition set unit setting the detection condition as a boundary condition of one of the plurality of behavior classes based on the counter of each of the plurality of behavior classes.