Method of controlling display on function operation screen

1. A method of controlling display on a function operation screen for allowing a user to perform multiple functions in an information utilizing device having the multiple functions, the method comprising:

storing a date of selection and use of each of the functions in a corresponding storage area;

calculating a number of elapsed days from a date of previous selection and use to a date of current selection and use for each of the functions based on the stored date;

calculating a frequency of use by using a predetermined formula based on the number of elapsed days of each of the functions;

deleting a function having a frequency of use of not larger than 10% from one of the display and a selection screen on the information utilizing device; and

displaying remaining items on the information utilizing device with larger characters in an empty space generated, as a result of deletion on function display, on one of the display and a selection item area according to deletion of the function items from one of the display and the selection screen;

wherein during the calculation of the frequency of use, the predetermined formula for calculating the frequency of use by using the number of elapsed days is a formula obtaining a frequency of use of not larger than 10% with the number of elapsed days set beforehand as a condition for deleting function display;

and wherein when the number of elapsed days is between a half year and a year and the frequency of use is not larger than 10(%), the frequency of use is calculated using the formula below:

Frequency of use (%)=100×10/(0.25×the number of elapsed days+10).

2. A method of controlling display on a function operation screen for allowing a user to perform multiple functions in an information utilizing device having the multiple functions, the method comprising:

storing a date of selection and use of each of the functions in a corresponding storage area;

calculating a number of elapsed days from a date of previous selection and use to a date of current selection and use for each of the functions based on the stored date;

calculating a frequency of use by using a predetermined formula based on the number of elapsed days of each of the functions;

deleting a function having a frequency of use of not larger than 10% from one of the display and a selection screen on the information utilizing device; and

displaying remaining items on the information utilizing device with larger characters in an empty space generated, as a result of deletion on function display, on one of the display and a selection item area according to deletion of the function items from one of the display and the selection screen; wherein

during the calculation of the frequency of use, the predetermined formula for calculating the frequency of use by using the number of elapsed days is a formula obtaining a frequency of use of not larger than 10% with the number of elapsed days set beforehand as a condition for deleting function display;

and wherein when the number of elapsed days is between three months and a half year and the frequency of use is not larger than 10(%), the frequency of use is calculated using the formula below:

Frequency of use (%)=100×10/(0.5×the number of elapsed days+10).

3. A method of controlling display on a function operation screen for allowing a user to perform multiple functions in an information utilizing device having the multiple functions, the method comprising:

storing a date of selection and use of each of the functions in a corresponding storage area;

calculating a number of elapsed days from a date of previous selection and use to a date of current selection and use for each of the functions based on the stored date;

calculating a frequency of use by using a predetermined formula based on the number of elapsed days of each of the functions;

deleting a function having a frequency of use of not larger than 10% from one of the display and a selection screen on the information utilizing device; and

displaying remaining items on the information utilizing device with larger characters in an empty space generated, as a result of deletion on function display, on one of the display and a selection item area according to deletion of the function items from one of the display and the selection screen;

wherein during the calculation of the frequency of use, the predetermined formula for calculating the frequency of use by using the number of elapsed days is a formula obtaining a frequency of use of not larger than 10% with the number of elapsed days set beforehand as a condition for deleting function display;

and wherein when the number of elapsed days is between three months and a half year and the frequency of use is not larger than 10(%), the frequency of use is calculated using the formula below:

Frequency of use (%)=100×10/(the number of elapsed days+10).

4. A method of controlling display on a function operation screen for allowing a user to perform multiple functions in an information utilizing device having the multiple functions, the method comprising:

storing a date of selection and use of each of the functions in a corresponding storage area;

calculating a number of elapsed days from a date of previous selection and use to a date of current selection and use for each of the functions based on the stored date;

calculating a frequency of use by using a predetermined formula based on the number of elapsed days of each of the functions;

deleting a function having a frequency of use of not larger than 10% from one of the display and a selection screen on the information utilizing device; and

displaying remaining items on the information utilizing device with larger characters in an empty space generated, as a result of deletion on function display, on one of the display and a selection item area according to deletion of the function items from one of the display and the selection screen;

wherein during the calculation of the frequency of use, the predetermined formula for calculating the frequency of use by using the number of elapsed days is a formula obtaining a frequency of use of not larger than 10% with the number of elapsed days set beforehand as a condition for deleting function display;

and wherein when the number of elapsed days is between three months and a half year and the frequency of use is not larger than 10(%), the frequency of use is calculated using the formula below:

Frequency of use (%)=100×10/(4×the number of elapsed days+10).

5. A method of controlling display on a function operation screen for allowing a user to perform multiple functions in an information utilizing device having the multiple functions, the method comprising:

storing a date of selection and use of each of the functions in a corresponding storage area;

calculating a number of elapsed days from a date of previous selection and use to a date of current selection and use for each of the functions based on the stored date;

calculating a frequency of use by using a predetermined formula based on the number of elapsed days of each of the functions;

deleting a function having a frequency of use of not larger than 10% from one of the display and a selection screen on the information utilizing device; and

displaying remaining items on the information utilizing device with larger characters in an empty space generated, as a result of deletion on function display, on one of the display and a selection item area according to deletion of the function items from one of the display and the selection screen;

wherein during the calculation of the frequency of use, the predetermined formula for calculating the frequency of use by using the number of elapsed days is a formula obtaining a frequency of use of not larger than 10% with the number of elapsed days set beforehand as a condition for deleting function display;

and wherein when the number of elapsed days is between three months and a half year and the frequency of use is not larger than 10(%), the frequency of use is calculated using the formula below:

Frequency of use (%)=100×10/(13×the number of elapsed days+10).