Disclosed herein is an access point name (APN) access method including: (a) checking whether an APN server is accessible via a wireless network connected to a telematics device that is powered on when an amount of time during which an APN change alarm message can be received has elapsed; (b) checking whether an APN update is necessary using an administration APN pre-stored in the telematics device when the APN server is not accessed, and acquiring APN update data from the APN server when the APN server is accessed; and (c) transmitting and receiving data between the telematics device and a data server using the acquired APN update data.