| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the total amount for eaten sushi can be easily calculated without using a calculator in a rotating sushi bar. SOLUTION: In a portable telephone set with a calculation function, a telephone function is switched to the calculation function by pressing down a predetermined prescribed key. Each of keys between one and zero is configured to display a prescribed amount of money and×, and further a * key is configured to display a subtotal while a # key is configured to display the grand total in the calculation function. At the time of being switched to the calculation function, groups of required amount of money are called out among various prescribed amount of money inputted to each key between one and zero by pressing down a separately determined key. Further, numerical keys are temporarily returned to original numerical keys by a separately determined key, and after the end of calculation, the calculation function is returned to the telephone function by pressing down the prescribed key again. COPYRIGHT: (C)2005,JPO&NCIPI
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