I have our protein sequence and I knew the N and C terminus ends, but I want to know that from where the N terminus ends and the C terminal end has started.
I do not quite understand your question.
The N-terminus is the alpha amino group of first amino acid in your sequence, the C-terminus the alpha-carboxylate of the last amino acid in your sequence. Do you mean what you want to know whether your protein lost any of its terminal sequences, e.g. due to proteolytic processes or because they have been intentionally omitted or tags been added in the expression construct you used?
If so, align your sequence to the reference sequence of your protein derived from the open reading frame, e.g by blast-searching UniProt (https://www.uniprot.org) for your sequence.
Ajit Kumar to determine the length of a protein sequence, you can use SnapGene viewer (SnapGene | Software for everyday molecular biology) or Benchling (Cloud-based platform for biotech R&D | Benchling). They are really good to sequence, blast or align your proteins.
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