| 摘要 |
PROBLEM TO BE SOLVED: To use an on-vehicle device as a personal terminal while effectively using a memory card. SOLUTION: The memory card M is inserted into a memory card insertion slot 4 of a portable telephone set 1 to store a shopping list on the memory card M, which is carried and inserted into a memory card insertion slot 6 of a car audio device 5 mounted on an automobile to display the shopping list on a liquid crystal display 7 of the car audio device 5. Consequently, unnecessary article is not bought, the same article is never repeatedly bought, and unscheduled buying is eliminated.
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