| 摘要 |
To control presence or absence of operation guidance and display timing depending upon usage. A radio frequency signal which is received by an antenna 1 is frequency-converted by a wireless unit 2. After removal of noise, the signal is demodulated and is fed to a control unit 3. Power supply unit 7 supplies electric power to each unit. When the operating unit 6 is operated and a given presetting image is displayed on a display unit 5, control unit 3 determines based upon information on operation guidance display object image stored in storing unit 4 whether or not the presetting image is an object of the operation guidance. If it is the object of the operation guidance display, the operation guidance is displayed when the flag of the operation guidance display in the storing unit 4 is ON. When the presetting operation corresponding to the presetting operation is conducted by the operating unit 6, the error rate of operation is calculated. The flag of the operation guidance display is updated into "ON" and "OFF" when the error rate is higher and lower than a reference value, respectively. The control unit 3 displays the operation guidance when the flag of the operation guidance display is ON.
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