| 摘要 |
PROBLEM TO BE SOLVED: To change a telephone number for domestic communication into a telephone number for international communication at the time of operating international communication even when an owner registers the telephone number of the other party in a telephone book memory as the telephone number for domestic communication. SOLUTION: The identification number of a network with which a portable telephone set is connected at present is read from a network connection controlling and managing means 9. In this case, when it is recognized that calling to the other party is international calling by confirming the present position country from a network data table 4, and the telephone number of the destination of calling is registered as a telephone number for domestic communication, the telephone number is converted into a telephone number for international communication by using a telephone number converting means 5.
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