Section 377 in The Code Of Criminal Procedure, 1973
377. Appeal by the State Government against sentence.
(1) Save as otherwise provided in sub-section (2) the State Government may in any case of conviction on a trial held by any Court other than a High Court direct the Public Prosecutor to present an appeal to the High Court against the sentence on the ground of its inadequacy.
(2) if such conviction is in a case in which the offense has been investigated by the Delhi Special Police Establishment constituted under the Delhi Special Police Establishment Act 1946 (25 of 1946 ) or by any other agency empowered to make an investigation into an offense under any Central Act other than this Code the Central Government may also direct] the Public Prosecutor to present an appeal to the High Court against the sentence on the ground of its inadequacy.
(3) When an appeal has been filed against the sentence on the ground of its inadequacy the High Court shall not enhance the sentence except after giving to the accused a reasonable opportunity of showing cause against such enhancement and while showing cause the accused may plead for his acquittal or for the reduction of the sentence.