Patent ID: 7177826

Claim:
A sales supporting system associated with a navigation system to provide store information, said sales supporting system comprising: store information transmitting means for transmitting store information including information on at least goods and prices that stores are dealing in, and positions of the stores; means for guiding routes to destinations that purchasers set optionally; means for calculating costs C 1 necessary for movements to the destinations and predicted values of required times T 1 necessary for movements to the destinations; store listing means for listing stores that deal in goods for desired purchase according to inputs of the purchasers based on the store information transmitted by said store information transmitting means; means for calculating costs C 2 necessary for movements to the destinations via the listed stores respectively and the predicted values of required times T 2 necessary for movements to the destinations via the listed stores respectively; means for calculating priority level judging parameters P c on costs, in the case where a route undergoes changes, based on sums of balances between the costs C 2 subject to route changes and the costs C 1 prior to route changes and prices of the goods; means for calculating priority level judging parameters P t on time from increased portions of required times given by the required times T 1 and T 2 ; priority setting means for calculating comprehensive priority level judging parameters P according to a formula P=W c ×P c +W t ×P 1 with weighting W c toward priority levels on costs and weighting W t toward priority levels on time that are set in advance, to give higher priority to stores for purchase in order of smaller comprehensive priority level judging parameters P; and means for notifying the purchasers of store information based on the set priority.