FIELD: electronic engineering. SUBSTANCE: method involves storage of data coming from several card-issuing offices to common multifunction card in separately assigned discrete sections of its electronic memory; characteristic data of particular office that has given card are randomly invoked from electronic memory by user who manually operates external switching device of multifunctional card. Novelty is that these data are sequentially visualized outside in at least one vacant indicator window of multifunction card and signature personally made by user at moment of using multifunction card is compared with that stored in central computer and/or in electronic memory of multifunction card. EFFECT: facilitated use of set of documents such as credit cards. 22 cl, 5 dwg
