A method and apparatus for providing a guide for combining pattern pieces receives a selection of a first point in a first pattern piece and a selection of a second point in a second pattern piece to be combined with the first pattern piece, generates a virtual pattern piece in response to the selection of the second point being received, arranges the virtual pattern piece such that a third point in the virtual pattern piece having a position corresponding to the first point in the first pattern piece is matched to the second point in the second pattern piece, and provides a guide for combining the first pattern piece and the second pattern piece by moving the virtual pattern piece such that an outer line of the second pattern piece and an outer line of the virtual pattern piece correspond to each other.