KEY INFORMATION SHARING SYSTEM, DELIVERY DEVICE AND USER TERMINAL

A server that shares key information to a portable terminal includes processing circuitry configured to deliver the key information to the portable terminal. The key information is associated with an object equipped with a control device, and the control device performs a predetermined control to the object when the control device receives the key information from an external terminal. The key information includes restriction information, where the restriction information sets a restriction content for the predetermined control.