Locking and unlocking control system and locking and unlocking control method

A locking and unlocking control method, comprising:

• not permitting unlocking of a door of a predetermined region that is locked, which is defined in a vehicle or a facility, by a second user different from a first user when a parcel is determined to be present in the predetermined region at a timing earlier than a scheduled access time when access by the second user to the predetermined region is scheduled, the parcel being associated with the first user and the second user is not a recipient of the parcel.

A non-transitory computer-readable storage medium that stores instructions causing a processor to execute a control process for locking and unlocking, comprising:

• not permitting unlocking of a door of a predetermined region that is locked, which is defined in a vehicle or a facility, by a second user different from a first user when a parcel is determined to be present in the predetermined region at a timing earlier than a scheduled access time when access by the second user to the predetermined region is scheduled, the parcel being associated with the first user and the second user is not a recipient of the parcel.