Abstract:
According to an aspect of an embodiment, an apparatus having an input device for inputting information and a display for displaying information comprises, a storage for storing information corresponding to an ultra violet ray intensity in association with location information and time information and a processor for obtaining information of an ultra violet ray intensity on the basis of location information and time information inputted by the input device in reference to the information stored in the storage, and for displaying the obtained information of the ultra violet ray intensity on the display.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a method for calculating the intensity of ultraviolet (UV) radiation. 
   2. Description of the Related Art 
   Japanese Unexamined Patent Application Publication No. 2006-17708 is given as a related art document. 
   SUMMARY 
   According to an aspect of an embodiment, an apparatus having an input device for inputting information and a display for displaying information comprises, a storage for storing information corresponding to an ultra violet ray intensity in association with location information and time information and a processor for obtaining information of an ultra violet ray intensity on the basis of location information and time information inputted by the input device in reference to the information stored in the storage, and for displaying the obtained information of the ultra violet ray intensity on the display. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a diagram of a hardware configuration of an information terminal; 
       FIG. 2  is a function block diagram of processing of obtaining a UV-information value; 
       FIG. 3  is a diagram of a data storage unit; 
       FIG. 4  is an illustration describing location data; 
       FIG. 5  is a first illustration describing UV-radiation-intensity data for all days every month; 
       FIG. 6  is a second illustration describing UV-radiation-intensity data for all days every month; 
       FIG. 7  is an illustration describing UV-radiation-intensity-ratio data for each weather condition; 
       FIG. 8  is an illustration describing minimal-erythema-dose data for each skin type; 
       FIG. 9  is a first flowchart of processing of estimating the UV-information value; 
       FIG. 10  is a second flowchart of processing of estimating the UV-information value; 
       FIG. 11  is a flowchart of processing of obtaining a UV-information value; 
       FIG. 12  is a diagram of a hardware configuration of an information terminal; 
       FIG. 13  is a function block diagram of processing of obtaining a UV-information value; 
       FIG. 14  is a first flowchart of processing of estimating the UV-information value; 
       FIG. 15  is a second flowchart of processing of estimating the UV-information value; and 
       FIG. 16  is a third flowchart of processing of estimating the UV-information value. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   The depletion of the ozone layer blocking hazardous UV radiation has been continuing. The amount of hazardous UV radiation that reaches the ground has increased due to the depletion of the ozone layer, so that premature skin aging or skin cancer may be caused. Accordingly, in order to cope with problems due to UV radiation, for example, people need to apply sunscreen on their skin. 
   Various technologies for coping with the problems due to UV radiation have been suggested. For example, there is a technology that can provide information concerning a current location of a user and the intensity of UV radiation in the vicinity of the location. 
   However, this technology can provide only the current intensity of UV radiation for the user. Accordingly, the user has to cope with the problems due to UV radiation on the basis of the limited information concerning only the current intensity of UV radiation. 
   Embodiments according to the present invention will be described with reference to the accompanying drawings. 
   First Embodiment 
   Hardware Configuration: 
     FIG. 1  shows a hardware configuration of a portable telephone that is a portable apparatus according to a first embodiment. As shown in  FIG. 1 , a portable telephone  100  includes a central processing unit (CPU)  102 , a display unit  104 , a nonvolatile memory  106 , a random access memory (RAM)  108 , a control unit  110 , a communication unit  112 , and a bus  114 . Each of the units will be described below. 
   The CPU  102  runs various types of programs including an operating system (OS) and the like loaded into the RAM  108 . The RAM  108  is used as an operation area in which the programs read from the nonvolatile memory  106  are run. The display unit  104  displays an image based on an instruction, such as reporting of a calculation result, output from the CPU  102 . The nonvolatile memory  106  is, for example, a flash memory, and the various types of programs run by the CPU  102  are stored in the nonvolatile memory  106 . The control unit  110  has a detection circuit for detecting operations of a plurality of keys. The detection circuit reports information concerning operated keys to the CPU  102 . 
   Processing of Estimating UV Information: 
     FIG. 2  is a function block diagram simply showing an example of processing of estimating information concerning UV radiation. A function of processing of estimating UV radiation information is realized in the RAM  108  and the nonvolatile memory  106 . The RAM  108  includes a location-information-obtaining unit  116 , a date-and-time-information-obtaining unit  118 , a comparative-data-selecting unit  120 , a weather-condition-obtaining unit  122 , a UV-radiation-information-value-estimation-processing unit  124 , and a UV-radiation-information-reporting unit  126 . The nonvolatile memory  106  includes a date-and-time-information-management unit  128  and a data storage unit  130 . As shown in  FIG. 3 , the data storage unit  130  includes location data  132 , UV-radiation-intensity data  134 , UV-radiation-intensity-ratio data  136 , and minimal-erythema-dose (MED) data  138 . Each of the units will be described below. 
   The location-information-obtaining unit  116  obtains location information on the basis of information input from the control unit  110  by a user. The location-information-obtaining unit  116  can also obtain the location information through the communication unit  112 . 
   The date-and-time-information-obtaining unit  118  obtains date-and-time information from a date-and-time-information-management unit  128 . The date-and-time-information-management unit  128  gives date-and-time information to the date-and-time-information-obtaining unit  118 . 
   The comparative-data-selecting unit  120  obtains Position_ID using the location data  132  on the basis of the location information, which is obtained by the location-information-obtaining unit  116  through the communication unit  112 . The location data  132  will be described below. 
   The weather-condition-obtaining unit  122  obtains a weather condition on the basis of information input from the control unit  110  by the user. The weather-condition-obtaining unit  122  can also obtain the weather condition through the communication unit  112  using a service provided by a weather company. 
   The UV-radiation-information-value-estimation-processing unit  124  estimates the intensity of UV radiation for an estimated time zone specified by the user. Here, the intensity of UV radiation is represented as, for example, a UV index, and the level of protection against UV radiation is represented as, for example, a sun protection factor (SPF), or a protection grade (PA) of ultraviolet radiation A (UVA). 
   The UV index is an index representing the intensity of hazardous UV radiation. 
   The SPF is an index representing a protective effect against ultraviolet radiation B (UVB) light defined as “(an MED in a case where a sunscreen is applied on skin)/(an MED in a case where no sunscreen is applied on skin)”. Here, UVB light is an element included in sunlight. When a user is exposed to UVB light, the skin of the user becomes red and sunburned such that the skin starts to peel off. The SPF represents how many times the length of a period until erythema occurs on the skin of the user can be extended in a case where the user is exposed to UV radiation. For example, when an SPF-30 sunscreen is used, the length of the period until erythema occurs can be extended to thirty times that in a case where no sunscreen is used. Accordingly, when a dose of UV-radiation causing erythema to which the user is exposed is smaller than or equal to the MED in a case where a sunscreen is applied on skin, protection against sunburn can be provided. The dose of UV-radiation causing erythema is defined as “25×(UV index)”, and the unit of the dose of UV-radiation causing erythema is [mW/m 2 ]. 
   Using the MED, the UV-radiation-information-value-estimation-processing unit  124  calculates the SPF using the expression “(25×(UV index)×3600×T/1000000)/the MED”. Here, the unit of MED is [KJ/m 2 ]. With this calculation, a UV-radiation-information value can be calculated without performing complicated modeling. Accordingly, the UV-radiation-information value can be calculated without using a high-performance CPU, and the number of operations is small, so that the power consumption can be suppressed. 
   The UV-radiation-information-value-estimation-processing unit  124  determines the PA on the basis of the calculated SPF. The PA is an index representing a protective effect against UVA light. The wavelength of UVA light is longer than that of UVB light. In most cases, when a user is exposed to UVA light, the skin of the user does not become markedly red. While the SPF represents a prevention of redness of the skin, the PA represents a prevention of melanism of the skin. For example, when the SPF is more than or equal to 0 and less than 10, a sunscreen having a protective effect represented as a symbol PA+ should be used; when the SPF is more than or equal to 10 and less than 30, a sunscreen having a protective effect represented as a symbol PA++ should be used; and when the SPF is more than or equal to 30, a sunscreen having a protective effect represented as a symbol PA+++ should be used. The PA has the three grades, and the more “+” signs there are, the greater the protective effect against UVA light. 
   The UV-radiation-information-reporting unit  126  displays the UV index, the SPF, and the PA, which are calculated or determined by the UV-radiation-information-value-estimation-processing unit  124 , on the display unit  104 . 
     FIG. 4  is an illustration describing the location data  132 . As shown in  FIG. 4 , the location data  132  includes Position_ID  202 , position data  210 , latitude data  212 , and longitude data  214 . When the location-information-obtaining unit  116  obtains the location information through the communication unit  112 , the comparative-data-selecting unit  120  obtains Position_ID using the location data  132  on the basis of obtained latitude and longitude data included in the location information. 
     FIGS. 5 and 6  are illustrations describing the UV-radiation-intensity data  134  for all days every month. As shown in  FIGS. 5 and 6 , the UV-radiation-intensity data  134  for all days every month includes the Position_ID  202 , months  204 , times  206 , and UV indices  208 . UV indices for each hour were measured on clear days in the past at locations represented by the Position_ID  202 , and the average data of the UV indices, i.e., the UV indices  208 , are divided into three groups for every month, which are a group of the beginning of a month, a group of the middle of a month, and a group of the end of a month, as the months  204 . The data may be updated on a regular basis. The information corresponding to an ultra violet ray intensity is associated with location information and time information. 
     FIG. 7  is an illustration describing the UV-radiation-intensity-ratio data  136  for each weather condition. As shown in  FIG. 7 , the UV-radiation-intensity-ratio data  136  includes weather conditions  216  and intensity ratios  218 . Each of the intensity ratios  218  is a ratio of the intensity of light having a wavelength such that the ozone layer strongly absorbs UV light from the sun to the intensity of light having a wavelength such that the ozone layer negligibly absorbs UV light. Since the UV indices  208  included in the UV-radiation-intensity data  134  for all days every month are measured under the clear days, in order to obtain a UV index in each weather condition, the multiplication of each of the UV indices  208  by one of the intensity ratios  218  is performed. 
     FIG. 8  is an illustration describing the MED data  138  for each skin type. As shown in  FIG. 8 , the MED data  138  includes skin types  220  and MEDs  222 . Each of the MEDs  222  is a minimum amount of light necessary for causing erythema with twenty-four hours of exposure to UVB radiation. Type I is a type of skin that easily becomes red and but difficultly becomes brown by sunburn. Type II is a type of skin that becomes red by sunburn and then becomes brown. Type III is a type of skin that does not become red but becomes melanized. As described above, the MED is used to calculate the SPF. As described above, since the information concerning UV radiation and the like is stored in the data storage unit  130 , for example, communication with an external server to obtain information is not required. Accordingly, since communication expenses do not arise or communication processing is not required, the CPU  102  is not burdened. Additionally, because an external apparatus such as a server is not required, the cost of structuring or maintaining equipment is not high. 
   Entire Flow According to First Embodiment: 
   Estimation processing of a UV information value will be described below with reference to  FIGS. 9 and 10 . Here, the UV information value is a generic term including the UV index, the SPF, and the PA described above. 
   In step S 101 , the location-information-obtaining unit  116  obtains location information through the communication unit  112 . The location information can be obtained from a base station or a global positioning system (GPS) as, for example, information concerning latitude and longitude. Additionally, for example, information input from the control unit  110  by the user can be used as the location information. The control unit  110  is an input device. The process proceeds to step S 102 . 
   In step S 102 , the date-and-time-information-obtaining unit  118  obtains an estimated time zone input from the control unit  110  by the user. The estimated time zone is a period predetermined by the user. The estimated time zone is represented as, for example, “10 to 13”. The process proceeds to step S 103 . 
   In step S 103 , the CPU  102  determines whether F_Time becomes 0 or not. F_time represents the number of hours included in the estimated time zone. For example, when the estimated time zone is “10 to 13” as described above, F_time is 3. Every time information corresponding to an ultra violet ray intensity for one of the hours is obtained, F_time is decremented. That is, a case where F_time becomes 0 indicates that the acquisition of the UV information value for the time zone specified by the user has been completed. When F_time becomes 0, the process proceeds to step S 113  in  FIG. 13 . In contrast, when F_time does not become 0, the process proceeds to step S 104 . 
   In step S 104 , the comparative-data-selecting unit  120  obtains Position_ID using the location data  132  on the basis of the location information obtained in step S 101 . Furthermore, the comparative-data-selecting unit  120  obtains a UV index using the UV-radiation-intensity data  134  on the basis of the estimated time zone, which is obtained in step S 102 , and the Position_ID. The process proceeds to step S 105 . 
   In step S 105 , the weather-condition-obtaining unit  122  obtains a weather condition. The weather condition can be input from the control unit  110  by the user. The weather condition can also be obtained through the communication unit  112  as information provided by a weather company. The process proceeds to step S 106 . 
   In step  106 , the UV-radiation-information-value-estimation-processing unit  124  obtains an intensity ratio corresponding to the weather condition using the UV-radiation-intensity-ratio data  136  on the basis of the weather condition obtained by the weather-condition-obtaining unit  122  in step S 105 . The process proceeds to step S 107 . 
   In step S 107 , the UV-radiation-information-value-estimation-processing unit  124  multiplies the UV index, which is obtained by the comparative-data-selecting unit  120  in step S 104 , by the intensity ratio obtained in step  106  to obtain a value. The process proceeds to step S 108 . 
   In step S 108 , the UV-radiation-information-value-estimation-processing unit  124  associates the value obtained in step S 107  with a corresponding time and then stores the associated value in the nonvolatile memory  106 . The process proceeds to step S 109 . 
   In step S 109 , the UV-radiation-information-value-estimation-processing unit  124  obtains an MED using the MED data  138  for each skin type on the basis of a skin type input from the control unit  110  by the user. The process proceeds to step S 110 . 
   In step S 110 , the UV-radiation-information-value-estimation-processing unit  124  calculates an SPF. The process proceeds to step S 111 . 
   In step S 111 , the UV-radiation-information-value-estimation-processing unit  124  obtains accumulation of the calculated SPFs and then stores the integrated SPF in the nonvolatile memory  106 . The process proceeds to step S 112 . 
   In step S 112 , the CPU  102  decrements F_time. The process returns to step S 103 . In this manner, the above-described process is repeated until F_time becomes 0, i.e., until UV information values whose number is equal to the number of hours in the estimated time zone specified by the user, is obtained. Then, in step S 103 , when the CPU  102  determines that F_time has become 0, the process proceeds to step S 113  in  FIG. 10 . 
   In step S 113  in  FIG. 10 , the UV-radiation-information-value-estimation-processing unit  124  determines whether or not the integrated SPF, which is stored in the nonvolatile memory  106 , is more than or equal to 0 and less than 10. When the integrated SPF is more than or equal to 0 and less than 10, the process proceeds to step S 114 , and the UV-radiation-information-value-estimation-processing unit  124  stores the symbol PA+ in the nonvolatile memory  106 . In contrast, when the integrated SPF is not more than or equal to 0 and less than 10, the process proceeds to step S 115 . 
   In step S 115 , the UV-radiation-information-value-estimation-processing unit  124  determines whether or not the integrated SPF, which is stored in the nonvolatile memory  106 , is more than or equal to 10 and less than 30. When the integrated SPF is more than or equal to 10 and less than 30, the process proceeds to step S 116 , and the UV-radiation-information-value-estimation-processing unit  124  stores the symbol PA++ in the nonvolatile memory  106 . In contrast, when the integrated SPF is not more than or equal to 10 and less than 30, the process proceeds to step S 117 . 
   In step S 117 , the UV-radiation-information-value-estimation-processing unit  124  stores the symbol PA+++ in the nonvolatile memory  106 . The process proceeds to step S 118 . 
   In step S 118 , the UV-radiation-information-reporting unit  126  displays a UV information value on the display unit  104 . Here, the displayed UV information value includes the UV index calculated in step S 107 , the SPF calculated in step S 110 , and the PA determined in steps S 113  to  117 . The process ends. In the first embodiment, the user can cope with problems on the basis of the UV information value. 
   Second Embodiment 
   Although the UV information value is obtained for the estimated time zone on the basis of the location data and the like in the first embodiment, another configuration is possible. In a second embodiment, an example of obtaining a UV information value for a certain period in the past and reporting the amount of UV radiation, to which the user is exposed in the certain period, to the user will be described. 
   Entire Flow According to Second Embodiment: 
   In step S 201 , the CPU  102  obtains period information input from the control unit  110  by the user. The period information concerns a period, for example, a period of a month in the past, and the user wants to obtain an integrated UV information value corresponding to the period. The process proceeds to step S 202 . 
   In step S 202 , the CPU  102  determines whether or not UV indices whose number is equal to the number of all of the days in the period defined by the period information, which is input by the user, is obtained. When UV indices whose number is equal to the number of all of the days in the period is obtained, the process proceeds to step S 212 . In contrast, when UV indices whose number is equal to the number of all of the days in the period is not obtained, the process proceeds to step S 203 . 
   In step S 203 , the date-and-time-information-obtaining unit  118  obtains date information using the period information input by the user. The process proceeds to step S 204 . 
   In step S 204 , the location-information-obtaining unit  116  obtains location information of the portable telephone  100  for the date defined by the date information obtained in step S 203 . The location information of the portable telephone  100  is stored as a history, for example, in the nonvolatile memory  106 . The process proceeds to step S 205 . 
   In step S 205 , the date-and-time-information-obtaining unit  118  obtains information concerning a time zone in which the user was outside, which is input from the control unit  110  by the user. The date-and-time-information-obtaining unit  118  can obtain the information concerning the time zone in which the user was outside, i.e., the information concerning a time zone in which the user was exposed to UV radiation. The process proceeds to step S 206 . 
   In step S 206 , the CPU  102  determines whether or not UV indices whose number is equal to the number of all of the hours in the time zone in which the user was outside is obtained. When UV indices whose number is equal to the number of all of the hours in the time zone in which the user was outside is obtained, the process returns to step S 203 . In contrast, when UV indices whose number is equal to the number of all of the hours in the time zone in which the user was outside is not obtained, the process proceeds to step S 207 . 
   In step S 207 , the comparative-data-selecting unit  120  obtains a UV index on the basis of the date-and-time information obtained in step S 203 , the location information obtained in step S 204 , the information concerning the time zone in which the user was outside, which is obtained in step S 205 , and the UV-radiation-intensity data  134  for all days every month. The process proceeds to step S 208 . 
   In step S 208 , the weather-condition-acquiring unit  122  obtains a weather condition. In the second embodiment, in order to obtain information for the past, the weather condition can be obtained on the basis of information provided by a weather company through the communication unit  112 . The process proceeds to step S 209 . 
   In step S 209 , the UV-radiation-information-value-estimation-processing unit  124  obtains an intensity ratio corresponding to the weather condition using the UV-radiation-intensity-ratio data  136  on the basis of the weather condition, which is obtained by the weather-condition-obtaining unit  122  in step S 208 . The process proceeds to step S 210 . 
   In step S 210 , the UV-radiation-information-value-estimation-processing unit  124  multiplies the UV index, which is obtained by the comparative-data-selecting unit  120  in step S 207 , by the intensity ratio obtained in step  209  to obtain a value. The process proceeds to step S 211 . 
   In step S 211 , the UV-radiation-information-value-estimation-processing unit  124  associates the value obtained in step S 210  with a corresponding time and then stores the associated value in the nonvolatile memory  106 . The process returns to step S 206 , and one of UV information values for the specified time zone of a certain day is obtained. Furthermore, when UV information values whose number is equal to the number of all of the hours in the specified time zone of the certain day, the process returns to step S 202 . In this manner, UV information values whose number is equal to the number of all of the days in the specified period is obtained. When UV information values whose number is equal to the number of all of the days in the specified period is obtained, the process proceeds to step S 212 . 
   In step S 212 , the UV-radiation-information-value-estimation-processing unit  124  integrates the UV indices, which are stored in the nonvolatile memory  106 , for the time zone in which the user was outside in the specified period. The process proceeds to step S 213 . 
   In step S 213 , the UV-radiation-information-reporting unit  126  displays the integrated value in step S 212  on the display unit  104 . The process ends. In the second embodiment, the user can know the amount of UV radiation to which the user is exposed for one month in the past, and cope with problems on the basis of the amount of UV radiation. 
   Third Embodiment 
   Although the weather condition is determined on the basis of the information input by the user or the information provided by a weather company in the first and second embodiments, another configuration is possible. In a third embodiment, a photo diode (PD) sensor  115  is added to the configuration, and a weather condition is determined on the basis of a UV index acquired by the PD sensor  115 . 
   Hardware Configuration: 
     FIG. 12  shows a hardware configuration of a portable telephone that is a portable apparatus according to the third embodiment. The PD sensor  115  is newly added to the configuration described with reference to  FIG. 1 . The PD sensor  115  outputs the intensities of UVA and UVB radiations. Since the other elements of the configuration in the third embodiment are the same as those of the configuration described with reference to  FIG. 1 , the descriptions thereof are omitted. 
   Processing of Estimating UV Information According to Third Embodiment: 
     FIG. 13  is a function block diagram simply showing an example of processing of estimating information concerning UV radiation according to the third embodiment. 
   A UV-information-calculating unit  117  and a weather-condition-determining unit  121  are newly added to the configuration described with reference to  FIG. 2 . The new elements in the configuration will be described. Since the other elements of the configuration in the third embodiment are the same as those of the configuration described with reference to  FIG. 2 , the descriptions thereof are omitted. 
   The UV-information-calculating unit  117  obtains a UV index on the basis of the intensities of UVA and UVB radiations. 
   The weather-condition-determining unit  121  calculates a ratio using the expression “(UV index obtained by the UV-information-calculating unit  117 )/(UV index obtained by the comparative-data-selecting unit  120 )”. The weather-condition-determining unit  121  determines a weather condition on the basis of the above-described ratio and the UV-radiation-intensity-ratio data  136  for each weather condition. 
   Entire Flow According to Third Embodiment: 
   Estimation processing of a UV information value will be described below with reference to  FIGS. 14 ,  15 , and  16 . 
   In step S 301 , the UV-information-calculating unit  117  calculates a UV index on the basis of the intensities of UVA and UVB radiations. In the third embodiment, since the portable telephone includes the PD sensor  115 , the intensity of UV radiation can be easily obtained. The process proceeds to step S 302 . 
   In step S 302 , the location-information-obtaining unit  116  obtains location information through the communication unit  112 . The location information can be obtained from a base station or a GPS as, for example, information concerning latitude and longitude. The process proceeds to step S 303 . 
   In step S 303 , the date-and-time-information-obtaining unit  118  obtains an estimated time zone input from the control unit  110  by the user. The process proceeds to step S 304 . 
   In step S 304 , the CPU  102  determines whether F_Time becomes 0 or not. When F_time becomes 0, the process proceeds to step S 317 . In contrast, when F_time does not become 0, the process proceeds to step S 305 . 
   In step S 305 , the comparative-data-selecting unit  120  obtains Position_ID using the location data  132  on the basis of the location information obtained in step S 302 . Furthermore, the comparative-data-selecting unit  120  obtains a UV index using the UV-radiation-intensity data  134  on the basis of the estimated time zone, which is obtained in step S 303 , and the Position_ID. The process proceeds to step S 306 . 
   In step S 306 , the weather-condition-determining unit  121  calculates a ratio of the UV index obtained in step S 301  to the UV index obtained in step S 305 . The process proceeds to step S 307 . 
   In step S 307 , the weather-condition-obtaining unit  122  whether or not a weather condition is input from the control unit  110  by the user. When a weather condition is input, the process proceeds to step S 308 . When a weather condition is not input, the process proceeds to step S 309 . 
   In step S 308 , the weather-condition-obtaining unit  122  obtains a weather condition input by the user. The process proceeds to step S 310 . In contrast, in step S 309 , the weather-condition-obtaining unit  122  obtains a weather condition on the basis of the ratio calculated in step S 306  and the ultraviolet-radiation-intensity-ratio data  136 . The process proceeds to step S 310 . 
   In step S 310 , the UV-radiation-information-value-estimation-processing unit  124  obtains an intensity ratio corresponding to the weather condition using the UV-radiation-intensity-ratio data  136  on the basis of the weather condition obtained by the weather-condition-obtaining unit  122 . The process proceeds to step S 311 . 
   In step S 311 , the UV-radiation-information-value-estimation-processing unit  124  multiplies the UV index, which is obtained by the comparative-data-selecting unit  120  in step S 305 , by the intensity ratio obtained in step  310  to obtain a value. The process proceeds to step S 312 . 
   In step S 312 , the UV-radiation-information-value-estimation-processing unit  124  associates the value obtained in step S 311  with a corresponding time and then stores the associated value in the nonvolatile memory  106 . The process proceeds to step S 313 . 
   In step S 313 , the UV-radiation-information-value-estimation-processing unit  124  obtains a MED on the basis of a skin type input from the control unit  110  by the user. The process proceeds to step S 314 . 
   In step S 314 , the UV-radiation-information-value-estimation-processing unit  124  calculates an SPF. The process proceeds to step S 315 . 
   In step S 315 , the UV-radiation-information-value-estimation-processing unit  124  integrates the calculated SPFs in step S 314  and then stores the integrated SPF in the nonvolatile memory  106 . The process proceeds to step S 316 . 
   In step S 316 , the CPU  102  decrements F_time. The process returns to step S 304 . 
   In step S 304 , when the CPU  102  determines that F_time becomes 0, the process proceeds to step S 317  in  FIG. 16 . 
   In step S 317 , the UV-radiation-information-value-estimation-processing unit  124  determines whether or not the integrated SPF, which is stored in the nonvolatile memory  106 , is more than or equal to 0 and less than 10. When the integrated SPF is more than or equal to 0 and less than 10, the process proceeds to step S 318 , and the UV-radiation-information-value-estimation-processing unit  124  stores the symbol PA+ in the nonvolatile memory  106 . In contrast, when the integrated SPF is not more than or equal to 0 and less than 10, the process proceeds to step S 319 . 
   In step S 319 , the UV-radiation-information-value-estimation-processing unit  124  determines whether or not the integrated SPF, which is stored in the nonvolatile memory  106 , is more than or equal to 10 and less than 30. When the integrated SPF is more than or equal to 10 and less than 30, the process proceeds to step S 320 , and the UV-radiation-information-value-estimation-processing unit  124  stores the symbol PA++ in the nonvolatile memory  106 . In contrast, when the integrated SPF is not more than or equal to 10 and less than 30, the process proceeds to step S 321 . 
   In step S 321 , the UV-radiation-information-value-estimation-processing unit  124  stores the symbol PA+++ in the nonvolatile memory  106 . The process proceeds to step S 322 . 
   In step S 322 , the UV-radiation-information-reporting unit  126  displays a UV information value on the display unit  104 . Here, the displayed UV information value includes the UV index calculated in step S 311 , the SPF calculated in step S 314 , and the PA determined in steps S 317  to  321 . The process ends. 
   In this manner, in the third embodiment, as described in step S 307 , the weather-condition-obtaining unit  122  can automatically obtain the weather condition without any weather condition input by the user. Accordingly, the user does not have any inconvenience of inputting a weather condition. 
   In the embodiments of the present embodiment, the intensity of UV radiation can be obtained on the basis of the prepared UV-radiation-intensity data, information including the location-and-time information corresponding to the UV-radiation-intensity data, the obtained location information, and the input time information. Accordingly, the intensity of UV radiation corresponding to the obtained location information and the input time information can be provided. 
   The embodiments described above are merely exemplary in nature and are in no way intended to limit the present invention. Accordingly, various modifications can be made without departing from the spirit and scope of the present invention.