Abstract: A transportation management supporting system includes following a database and sections. A transportation managing DB stores distribution data related to physical distribution. A distribution cost calculating section calculates a distribution cost result data indicating a result of a physical distribution cost. A distribution simulation section estimates a first reduction rate for the cost reduction measures. An emission material calculating section calculates an emission material result data indicating a result of an emission material emitting quantity. An emission material simulation section estimates a second reduction rate for the emission material reduction measures. The distribution simulation section estimates a third reduction rate for the emission material reduction measures, and outputs the first and third reduction rate. The emission material simulation section estimates a fourth reduction rate for the cost reduction measures, and outputs the second and fourth reduction rate.