The invention discloses a communication navigation data updating 
system which comprises a communication navigation 
server, a download terminal and a navigation terminal; wherein, the communication navigation 
server is used for receiving an update and download request of the download terminal, downloading target communication navigation data from a communication navigation 
database according to the update and download request, and sending the target communication navigation data; the communication navigation 
database is used for storing the communication navigation data which comprises map data stored in 
layers and in blocks; the download terminal connected with the communication navigation 
server and the navigation terminal is used for sending the update and download request to the communication navigation server, receiving the target communication navigation data sent by the communication navigation server, 
processing the target communication navigation data and sending the target communication navigation data to the navigation terminal; the navigation terminal is used for receiving the target communication navigation data sent by the download terminal and updating the existing communication navigation data. The communication navigation data updating 
system improves the rate of download and update and meets the rapid update requirements of users at the navigation terminal. The invention also provides a communication navigation data updating method.