| 摘要 |
PROBLEM TO BE SOLVED: To easily determine a key to be operated next even when a user forgets the key which is operated in operation for successively inputting a plurality of keys in the predetermined order. SOLUTION: When a contact of any of the keys of a keyboard is turned on (step S1; Y), an LED arranged just below the key and corresponding to the key is lit (step S2). The lighting of the LED is maintained until any of the keys is pushed down next (step S6). The LED is lit when a predetermined flag is turned on (step S5; Y) and the user sets lighting of the LED by pushing down the key. COPYRIGHT: (C)2006,JPO&NCIPI
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