Creating customer in SAP for the data coming from non-SAP system

Hi,

I have to create customer for all the data coming from the non-SAP system in real time.So basiaclly need an interface where the communication between the SAP and non-SAP system takes place.

We are using webservices for comminuication but i need to know how can i create customer in SAP from the data that is coming in at certain frequency.

How can i do this using an IDOC or is there any other method?

Thanks,

Nishant.