| 摘要 |
The present invention relates to a method and system capable of gaining access (data transfer) to portable type mediums whose number is larger than the number of ports on a processing unit side. Thus, in this invention, by using a demultiplexer, to one or more portable type medium ports provided in a processing unit there are connected a plurality of portable type mediums whose number is larger than the number of the ports. The demultiplexer selectively switches the ports and, of the plurality of portable type mediums, the mediums to be accessed by the processing unit for establishing the connections therebetween. This invention is applicable to data transfer between a plurality of portable type mediums such as IC cards capable of storing digital money and a processing unit having an ability to gain access to these portable type mediums.
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