To promote use of point service, in its turn, to promote the purchase of a commodity (for example, to promote use of a card) by effectively informing point information, for example, to a person purchasing no commodity over a long period.

A point service provider side computer connected to a customer terminal via a network, reads out customer identification information on a customer purchasing no commodity for a first prescribed period on the basis of purchase day information from a purchase history file (Step S10), reads out a cumulative point number on the basis of the customer identification information from a point control file (Step S30), reads out exchange commodity information on the basis of the cumulative point number from an exchange commodity information file (Step S40), edits a message as including the cumulative point number and the exchange commodity information (Step S60), and transmits the message to a specified customer terminal on the basis of the customer identification information (Step S70).