To allow a specific person to unlock a commodity housing box (a commodity housing vessel) for housing a commodity delivered at absent time, that is, to prevent illicit unlocking.

In this system for controlling the commodity housing vessel having a vessel having inside a commodity housing space for housing the delivered commodity, an opening-closing door arranged on the vessel, and a lock means for locking the opening-closing door, the system comprises a portable information terminal for reading key data attached to the commodity and used for unlocking a lock by the lock means, a confirming means for confirming whether or not the acquired key data is preregistered by acquiring the key data read by the portable information terminal in a state of locking the opening- closing door, and a lock releasing means for unlocking the lock by ther lock means when the confirming means confirms that the key data is preregistered.