I need a good book which starts from quite beginner to learn about calculating the complexity of Algorithm??
The Aho, Hopcroft Ullman book "Design and analysis of computer algorithms" is a classic, Sedgewick's "Algorithms" should be very good (I haven't seen the recent 4th edition, though). A veritable encyclopaedia is Cormen, Leiserson, Rivest and Stein's "Introduction to algorithms". For a more advanced, mathematical view, Sedgewick and Flajolet's "An introduction to the analysis of algorithms" is very useful.