To shorten working hours while maintaining sales by efficiently visiting a plurality of vending machines.

The vending machines are classified by the number of kinds of articles to sell and a sale amount from completion of replenishment of the articles until the replenishment becomes necessary next is set by every period by every classified vending machine. A number obtained by dividing the previous sale amount within a prescribed period by a sale amount in a set corresponding period is calculated by every vending machine. A scheduled visiting date is set from the calculated number. A plurality of visiting places are stored together with directions, distance from a prescribed place and the scheduled visiting date within the prescribed period. The stored visiting places are indicated in a visiting schedule within the prescribed period on the stored visiting date with signs indicating the stored directions in order of the stored distances. The replenishment of each article and recovery of the sale are performed by the calculated number of frequencies for each vending machine based on the visiting schedule.