| 摘要 |
An ID memory part memorizes an ID such as a telephone number that identifies a communicant, and a use frequency memory part memorizes a corresponding use frequency. When a communication apparatus takes a sending action, a writing part receives the ID from an addressee communicant and registers it in the ID memory part. In case the ID memory part does not have any unused memory region at this registering time, the least frequently used ID is deleted from the ID memory part and the memory region that becomes unused as the result registers the received ID. When a communication apparatus takes a receiving action, a comparison part receives the ID from an addresser communicant and sequentially compares the ID with each ID memorized in the ID memory part, and has the communication apparatus continue the receiving action only when a conformance is detected. A use frequency updating part updates the use frequency on the use frequency memory part corresponding to the communicant's ID, when the communication apparatus takes a communication action. Thus, an ordinary sending operation alone automatically registers the ID. By properly deleting the least frequently used ID on the ID memory part at an automatic registering time, a new ID is automatically registered without any problem, which makes the registering operation further simplified.
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