1. A method for capturing a document by a mobile terminal apparatus, said method comprising: obtaining, by a document capturing device embodied on the mobile terminal apparatus, a two-dimensional image of the document; the document capturing device performing edge detection within the two-dimensional image to identify edges of the document; the document capturing device determining angles between detected edges; the document capturing device calculating, based on the detected edges and the angles determined, a three-dimensional position of the document relative to a position of the mobile terminal apparatus; the document capturing device calculating correction information to correct, by relative movement, the three-dimensional position of the document relative to the position of the mobile terminal apparatus; the document capturing device deriving first guidance information from the correction information; the document capturing device providing the first guidance information to a user of the mobile terminal apparatus, prompting the user to perform the relative movement such that the three-dimensional position of the document is correct relative to the position of the mobile terminal apparatus; and the document capturing device capturing the document.