Patent ID: 8428876

Claim:
A navigation system for updating partly a map layer, in which a management server updates map data of a user terminal through a wireless communication network, the navigation system comprising: a management server configured to transmit an occurrence of update to the user terminal when map data is updated, in which the management server produces an update area and an update layer based on a map data version which is acquired by the user terminal, transmits a layer list and a data capacity which is produced, and transmits update data requested by the user terminal; and a user terminal configured to transmit information about the map data version of that user terminal, in which the user terminal produces the layer list to be updated, requests the update data, and modifies old map data into the updated map data so that the data may be partly updated, wherein, the map data is divided into a plurality of layer units having connectivity with adjacent areas based on a data attribute and a data type, and the layer unit is defined as a basic update unit, wherein, the map data is composed of a plurality of layer units, including road data, which has connectivity with adjacent areas, in which the map includes each of a plurality of objects based on the data attribute and the data type, and wherein, when the update of the map data occurs, a determination is made that updated areas are included in a certain layer, and accordingly, only required layers are updated.