The present disclosure relates to a vehicle collision avoidance supporting apparatus and a vehicle collision avoidance supporting method that support avoidance of a collision of a subject vehicle about to enter an intersection with another vehicle (which may also be referred to as a crossing vehicle) traveling in a direction crossing the travel direction of the subject vehicle and about to enter the intersection. The vehicle collision avoidance supporting method is characterized in that after another vehicle (RV) approaches from the left direction or the right direction, the position of a collision position (Pcol) is determined; the position of a parking position (Pstp) is set based on the determined collision position (Pcol); and before arriving at the preset parking position (Pstp), warning (Warn) is performed according to the position opportunity (Pwarn) of the warning position (Pwarn) of parking.