A locking apparatus including a portable terminal having a terminal control section and a bottom plate, wherein the bottom plate includes a first connection terminal connected to the terminal control section and a locking hole; and a cradle having a seating portion, on which the portable terminal is seated, a cradle control section, a second connection terminal located in a position corresponding to the first connection terminal and connected to the cradle control section, and a locking member located in the seating portion in a position corresponding to the locking hole, wherein the locking member is inserted into the locking hole and rotates based on locking member rotation information.