Combine 2 ADSL line ?

I have a plan to build a small web-server for my website. I can not use leased line because it is too expensive. I intend to combine 2 ADSL line ( Up : 640 kbps / Down : 2 Mbps ) . I dont know that whether I need other devices ? Or just using 2 NIC is enough.

Thank you very much for your help !

 

 

 

 

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