Various embodiments of a searching method for a missing child using a two-dimensional bar code are disclosed. In one exemplary embodiment, the method may include photographing a two-dimensional bar code possessed by a missing child through a missing child prevention program and receiving current position information through a GPS module and stores the received position information. The method may also include transmitting the two-dimensional bar code and the stored position information to a two-dimensional bar-code server, receiving child and guardian information of the missing child from the two-dimensional bar code server, and displaying the received child and guardian information. The method may also include connecting a call to the missing child's guardian by inputting a call connection key.