Authentication information providing server, authentication information providing method, delivery user terminal, and locking and unlocking method

An authentication information providing method comprising:

• issuing, by the authentication information providing server authentication information corresponding to lock and unlock devices, each of lock and unlock device is configured to lock or unlock a corresponding one of predetermined compartments of a plurality of vehicles;
• issuing, by the authentication information providing server, the authentication information corresponding to a second one of the plurality of vehicles when there is a request from a delivery user terminal to set a place of delivery of a package to a vehicle different from a first one of the plurality of vehicles, corresponding to the authentication information issued first, the second one of the plurality of vehicles being different from the first one of the plurality of vehicles;
• and
• informing, by the authentication information providing server, to a terminal that is used by a recipient that the package has been delivered to the second one of the plurality of vehicles.