Electronic receipt information processing system and electronic device

A method for transmitting and receiving electronic receipt information in an electronic receipt information processing system having a first information processing device and a second information processing device, the method comprising:

• an electronic receipt information receiving step for receiving electronic receipt information having one or more information relating to purchase settlement of a commercial product or a service in the first information processing device;
• a first consumer's electronic receipt information transmitting step for obtaining auxiliary information on the basis of a part or all of the information of the electronic receipt information, and for generating consumer's electronic receipt information from the part or all of the electronic receipt information and the auxiliary information, and for transmitting the generated consumer's electronic receipt information in the first information processing device;
• a consumer's electronic receipt information receiving step for receiving the consumer's electronic receipt information in the second information processing device;
• and
• a second consumer's electronic receipt information transmitting step for transmitting a part or all of the consumer's electronic receipt information which is received in the consumer's electronic receipt information receiving step in the second information processing device.