Can we communicate Rockwell's RS View SCADA and LAN? If yes, how?

Using Ethernet connection by TCP/IP protocol, you can connect. Else use converter for different protocols.

 yes your question absolutely correct in my plant Allenbradley PLC RX LOGIX5563  control net /ethernet module  is connected to modem from modem its goes to PC where I have employed ROCKWELL SCADA RSVIEW32 this modem is having RJ11 PORTS  for ethernet connectivity ie LAN communication

I think you should also mention the second end of connection. The question is not clear. 

If you want to connect Rockwell PLC with RSview through Ethernet or anyother driver, you will have to use RSVIEW Enterprise.

If you want to expose RSview data to some third party , then you use any OPC

If you are asking how to expose the HMI of RSview, then you may use local hmi client or remote hmi client.

If your question is simply how to add ethernet driver, then you can do that by exploring the RSview enterprise window in RSview and adding Ethernet driver, then confirguing the IP address. 

Thanks