To provide a method for manufacturing data communication material becoming illegible by the melting of a resin in toner or not contaminated by transfer or the like by folding a unit sheet wherein a plurality of sheet pieces are joined through fold lines and bonding arbitrary opposed surfaces through a pseudo-adhesive sheet in a peelable manner.

A long sheet S comprising a specific paper material is delivered from a stocker to be folded and a pseudo-adhesive sheet F having a specific heat-sensitive adhesive layer arranged thereto is inserted in the gap between the opposed surfaces of the folded sheet and the opposed surface of the sheet pieces of the unit sheet (t) and the pseudo-adhesive sheet F are bonded at a specific temperature under specific pressure.