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Communication system and its method and communication apparatus and its method

DC CAFC
  • US 7,617,537 B2
  • Filed: 01/31/2005
  • Issued: 11/10/2009
  • Est. Priority Date: 09/21/1999
  • Status: Expired due to Fees
First Claim
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1. A communication method to transfer content data to a first apparatus from a second apparatus, comprising:

  • judging whether said first apparatus and said second apparatus are connected;

    comparing, upon judging that said first apparatus and said second apparatus are connected, an identifier of said first apparatus with an identifier stored in said second apparatus;

    comparing, when said identifier of said first apparatus corresponds to said identifier stored in said second apparatus, a first list of content data of said first apparatus and a second list of content data of said second apparatus;

    transferring, from the second apparatus to the first apparatus, first content data, which is registered in said second list and is not registered in said first list; and

    deleting, from the first apparatus, second content data, which is registered in said first list and is not registered in said second list.

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