Import Huge Leagacy Data

Hi,

We want to import around 20 lakhs of records from excel. I want to know what the best way of importing records performance wise is.

• .Net custom Application using Web Service Calls
• SSRS/SSIS using Web Service Calls.

Please let me know whether there is another better solution for importing records, Also I want to know is there any Bulk Import API calls for importing huge bulk of data

Thanks in Advance