A
carbon dioxide reduction promotion
system provided with a user terminal and a service
operator device, the user terminal having: a usage performance transmission unit that transmits, to the service
operator device, usage performance of
application software by a user and user identification information unique to the user; and a point reception unit that receives, from the service
operator device, a contribution point corresponding to the
actual use performance, and the service operator device is provided with: an
actual use performance reception unit that receives the
actual use performance and the user identification information from the user terminal; a request information creation unit that creates request information for
carbon dioxide reduction work on the basis of the actual use performance; a request
information transmission unit that transmits the request information to a reduction operator device; a reduction value reception unit that receives a reduction actual performance value from the reduction operator device; a reduction value transmission unit that transmits the reduction actual value to a supervisor device; a credit
score reception unit that receives, from the supervisor device, a
carbon dioxide credit
score corresponding to the reduction actual value; an integral calculation unit that calculates the contribution integral on the basis of the carbon dioxide credit
score and the utilization performance; and a point transmission unit that transmits the contribution points to the user terminal.