reading data displayed in a 16*2 lcd using arduino

Greetings. pls i need help on how to read data( intergers and characters) in an lcd using arduino. am working on a project and needs to read data displayed in one lcd which i dont have an idea about the type of microcontroller used in the circuit, all i need is access the pins and tap from there and used the information in my own circuit. all contributions are welcomed. thanks

If you know nothing, can't see the back of the LCD or don't want to even show a pic, what do you expect help with?

forkwa:
pls i need help on how to read data( intergers and characters) in an lcd using arduino.

This makes no sense.
The LCD is just a bitmap.
It does not know anything about integers and characters.