A payment system includes: a merchandise reading unit that reads merchandise; a merchandise information acquisition unit that obtains a merchandise information about the read merchandise; a confirmation information output unit that outputs a confirmation information for confirming with a customer an intention of payment of the merchandise; a receiving unit that receives an input from the customer for the confirmation information; a face acquisition unit that obtains a face image of the customer; an iris acquisition unit that obtains an iris image of the customer; and a payment processing unit that performs a payment process for the merchandise on the basis of the input from the customer and on the basis of at least one of the face image and the iris image. According to such a payment system, the payment process for the merchandise can be properly performed.