A server device includes a processor configured to i) acquire vehicle information when a delivery request is made; ii) acquire predetermined authentication information for unlocking and locking a door of a vehicle, based on the acquired vehicle information; iii) transmit the acquired predetermined authentication information to a delivery terminal; and iv) to acquire predetermined proof information for proving that a user of the vehicle is a rightful recipient of a delivery article, by communicating with a user terminal. The processor is configured to transmit the acquired predetermined authentication information to the delivery terminal, on a condition that the predetermined proof information is acquired.