A warning condition adjusting apparatus may include: a determination unit configured to determine whether a parking direction of an ego vehicle is a first direction or a second direction, using traveling information of a target vehicle; and a change unit configured to maintain a preset warning condition of a rear cross collision warning (RCCW) system when the parking direction of the ego vehicle is the first direction, and change the warning condition of the RCCW system when the parking direction of the ego vehicle is the second direction.