Patent ID: 8819730

Claim:
A method for channel scanning in a digital broadcast system, the method comprising: deleting all services stored in a database; after deleting all services stored in the database, storing services scanned through each frequency in a temporary storage unit, based on whether or not identical service Identifiers (IDs) and identical Logical Channel Numbers (LCNs) of the scanned services exist and whether or not a service having no LCN exist among the scanned services; performing a channel scanning for all frequencies; when there are services including the identical service ID as a result of the channel scanning, selecting at least one service from the services including the identical service ID and deleting unselected services after a passage of a predetermined time interval if there is no user selection; determining whether services remaining after the services including the identical service ID are removed from the scanned services, include services having the identical LCN; in response to the remaining services including the services having the identical LCN, selecting one service to maintain the identical LCN from the services having the identical LCN and allocating LCNs sequentially increasing from an LCN after a last LCN to unselected services according to each respective service type after the passage of the predetermined time interval if there is no user selection; determining whether the services remaining after the services including the identical service ID are removed from the scanned services include services that do not include LCN; in response to the remaining services including the services that do not include the LCN, allocating LCNs sequentially increasing from the LCN after the last LCN to the services that do not include the LCN according to the respective service type; and storing the remaining services processed in the temporary storage unit in the database, wherein the services including the identical service ID are transmitted on different frequencies.