TCP/IP or RS-232 are the common ways. Then is becomes a question of how to format your data over the bus.
I want to send data (analogue values) from LabView to raspberry pi. How can I achieve this?
First, please define your use of the term "analog values". Anything over TCP/IP, serial, etc. MUST be digitized first!.
True "analog" data can be received by using analog IO hardware, i.e. you would create a voltage in LabVIEW using a D/A converter and read it using a A/D converter on the other side.)