A digital map is the most important component of the car navigation system. Then, a landmark is used to select a direction for destination and to find a position of vehicle position easily and efficiently, but it has not been standardized and designed by human factors perspective technologies. This problem implies the possibilities to generate unsafe situation and non consistent compatibilities the driver`s information perception. This paper suggests the human factors design guidelines of the landmark for the designers and developer for the efficient human factors design. Experiment results that derived by the classification of dominant attributes of landmark give a solution of cognitive problems about resource competition. Then, its result indicates color, pattern, outline, text, graphic dimension are the effective factors for the human landmark perception, it also indicates that image pattern, multiple color, outline, text shaped landmark is the most efficient. Map developer must consider human factors and cognitive aspect of landmark to reduce those problems.