To provide a right information delivery method in a system for acquiring a right by electronically storing right information (information including the use right in itself such as ticket) in a right storage device (an IC card, the nonvolatile storage of a portable terminal, or the like).

A client comprises an information analysis part 102, a registration propriety determining part 105, an information registration part 107, an information cancel processing part 108, and a registration confirmation transmitting part 106. When the right information is registered according to the determination of the registration propriety determining part 105, it is registered in the information registration part, and the effect that the right information is cancelled and registered by the information cancelling processing part 108 is transmitted to an information transmitter 200 by the registration confirmation transmitting part 106, and when the right information is not registered, the effect that the right information is not cancelled or registered by the information cancel processing part 108 is transmitted to the information transmitter 200 by the registration confirmation transmitting part 106.