Rescue method, rescue system, wandering person care method, and wandering person care system

A rescue method for identifying and rescuing a person in question, the rescue method comprising an operation in which a user wearing a jewelry item having a serial number is encountered and the serial number on the jewelry item is recognized, an operation in which the serial number is conveyed to a data management company that stores the serial number as identification information pertaining to the user, an operation in which the identification information pertaining to the user is conveyed to a rescue organization, and an operation in which a command to rescue the user is issued at the rescue organization.