Abstract:
An electronic apparatus includes a sensor, a body that is provided separately from and is not incorporated to a shoe worn by a user, and a processing circuit provided on the body. The processing circuit obtains, based on a detection result of the sensor, a number of steps taken by the user during traveling while wearing the shoe, and calculates a wear degree, indicating a degree to which the shoe of the user is worn out, based on the number of steps.

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to an electronic apparatus and a program. 
     Priority is claimed on Japanese Patent Application No. 2012-193257, filed Sep. 3, 2012, the content of which is incorporated herein by reference. 
     Related Art 
     In the related art, a wristwatch for running is known in which an acceleration sensor detects the movement of a user to detect the number of steps or the traveling distance during traveling (for example, refer to Patent Document 1). Such a wristwatch includes means for measuring the number of steps and the distance per run; and means for accumulating the number of steps and the distance per month. In addition, shoes are worn out when being used, and the unique performance of the shoes gradually decreases when being worn out. 
     REFERENCE DOCUMENT 
     Patent Document 
     [Patent Document 1] Japanese Unexamined Utility Model Application, First Publication No. H2-59419 
     However, there is a problem in that, even when the appearance of shoes is observed, it is difficult to determine the wear degree of the shoes such as the wear degree of a midsole. In addition, the wristwatch described in Patent Document 1 can measure the results (for example, the number of steps, distance, and time) of running but cannot measure the wear degree of shoes used for running. 
     SUMMARY OF THE INVENTION 
     Therefore, the present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide an electronic apparatus capable of measuring the wear degree of shoes used for running, and a program therefor. 
     According to a first aspect of the present invention, there is provided an electronic apparatus including: a measuring unit that measures a number of steps of a user during traveling; and a wear degree calculating unit that calculates a wear degree, indicating a degree to which shoes of the user are worn out, based on the number of steps measured by the measuring unit. 
     In addition, according to a second aspect of the present invention, in the electronic apparatus according to the first aspect, the wear degree calculating unit may convert the number of steps measured by the measuring unit into the wear degree using a coefficient in consideration of information relating to the user 
     In addition, according to a third aspect of the present invention, in the electronic apparatus according to the second aspect, the information relating to the user may be a body weight of the user, a traveling speed of the user, a running level of the user, or a gender of the user. 
     In addition, according to a fourth aspect of the present invention, the electronic apparatus according to any one of the first to third aspects may further include: a display unit; a storing unit that stores a cumulative value of the wear degree; a cumulative value calculating unit that adds the wear degree, which is calculated by the wear degree calculating unit, to the cumulative value of the wear degree, which is stored in the storing unit, to calculate a new cumulative value of the wear degree; a cushioning property calculating unit that calculates cushioning properties of the shoes based on the cumulative value of the wear degree calculated by the cumulative value calculating unit; and a display control unit that displays the cushioning properties of the shoes, which is calculated by the cushioning property calculating unit, on the display unit. 
     In addition, according to a fifth aspect of the present invention, the electronic apparatus according to the fourth aspect may further include: a select unit that selects shoes, in which the storing unit stores a cumulative value of the wear degree for each pair of shoes of the user, the cumulative value calculating unit reads the cumulative value of the wear degree of the shoes, which are selected by the select unit, from the storing unit, and adds the wear degree, which is calculated by the wear degree calculating unit, to the read cumulative value of the wear degree to calculate a new cumulative value of the wear degree of the shoes selected by the select unit, and the cushioning property calculating unit calculates cushioning properties of the shoes, which are selected by the select unit, based on the cumulative value of the wear degree calculated by the cumulative value calculating unit. 
     In addition, according to a sixth aspect of the present invention, the electronic apparatus according to the fourth or fifth aspect may further include: an input unit that receives an input of an instruction to initialize the wear degree; and an initializing unit that initializes, when the instruction to initialize the wear degree is input to the input unit, the cumulative value of the wear degree stored in the storing unit. 
     In addition, according to a seventh aspect of the present invention, the electronic apparatus according to any one of the first to sixth aspects may further include: an acceleration sensor that detects an acceleration, in which the measuring unit measures a number of steps based on the acceleration detected by the acceleration sensor. 
     In addition, according to an eighth aspect of the present invention, the electronic apparatus according to any one of the first to sixth aspects may further include: an acceleration sensor that detects an acceleration; and a timekeeping unit that keeps time, in which the measuring unit measures a traveling pitch of the user within a predetermined amount of time based on the acceleration detected by the acceleration sensor, and measures a number of steps of the user during traveling based on the measured traveling pitch and a traveling time of the user. 
     In addition, according to a ninth aspect of the present invention, in the electronic apparatus according to the seventh or eighth aspect, the acceleration sensor may be built into a wristwatch including a display unit on which information relating to the wear degree calculated by the wear degree calculating unit is displayed. 
     In addition, according to a tenth aspect of the present invention, in the electronic apparatus according to the seventh or eighth aspect, the acceleration sensor may be built into an apparatus which is mountable on the shoes of the user. 
     In addition, according to an eleventh aspect of the present invention, in the electronic apparatus according to the seventh or eighth aspect, the acceleration sensor may be built into the shoes of the user. 
     In addition, according to a twelfth aspect of the present invention, there is provided a program causing a computer to execute the following steps including: a step of measuring a number of steps of a user during traveling; and a step of calculating a wear degree, indicating a degree to which shoes of the user are worn out, based on the measured number of steps. 
     According to the present invention, the measuring unit measures a number of steps of a user during traveling. In addition, the wear degree calculating unit calculates a wear degree, indicating a degree to which shoes of the user are worn out, based on the number of steps measured by the measuring unit. As a result, the wear degree of the shoes of the user can be calculated based on the number of steps of the user during traveling. That is, the wear degree is calculated by using the number of steps of the user during traveling as an index indicating a degree to which the shoes are used up. Accordingly, the wear degree of the shoes used for running can be measured. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block diagram illustrating a configuration of a wristwatch according to a first embodiment of the present invention. 
         FIG. 2  is a graph illustrating a relationship between a load applied to shoes, and the body weight and the traveling speed in the first embodiment of the present invention. 
         FIG. 3  is a graph illustrating a relationship between the traveling speed and the running level in the first embodiment of the present invention. 
         FIG. 4A  is a schematic diagram illustrating the display content indicating the cushioning properties of the shoes which is displayed on a display unit in the first embodiment of the present invention. 
         FIG. 4B  is a schematic diagram illustrating a display example in which the cushioning properties are indicated in black in a bar L indicating the cushioning properties of the shoes displayed on the display unit in the first embodiment of the present invention. 
         FIG. 4C  is a schematic diagram illustrating a display example in which the cushioning properties are indicated in white in the bar L indicating the cushioning properties of the shoes displayed on the display unit in the first embodiment of the present invention. 
         FIG. 5  is a flowchart illustrating the procedure of a cushioning property display process which is executed by the wristwatch according to the first embodiment of the present invention. 
         FIG. 6  is a flowchart illustrating the procedure of a cushioning property display process which is executed by a wristwatch according to a second embodiment of the present invention. 
         FIG. 7  is a flowchart illustrating the procedure of an initialization process which is executed by a wristwatch according to a third embodiment of the present invention. 
         FIG. 8  is a flowchart illustrating the procedure of a cushioning property display process which is executed by a wristwatch according to a fourth embodiment of the present invention. 
         FIG. 9  is a flowchart illustrating the procedure of a cushioning property display process which is executed by a wristwatch according to a fifth embodiment of the present invention. 
         FIG. 10  is a flowchart illustrating the procedure of a cushioning property display process which is executed by a wristwatch according to a sixth embodiment of the present invention. 
         FIG. 11A  is a diagram illustrating an example of the present invention in which an acceleration sensor for the measuring number of steps of a user is built into a wristwatch  100 . 
         FIG. 11B  is a diagram illustrating an example of the present invention in which an acceleration sensor for measuring the number of steps of a user is built into a peripheral apparatus which is mountable on the outside of the shoes (for example, a shoelace). 
         FIG. 11C  is a diagram illustrating an example of the present invention in which an acceleration sensor for measuring the number of steps of a user is built into shoes of the user. 
         FIG. 12  is a diagram illustrating an example of a method according to the present invention of measuring the number of steps using an acceleration sensor. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     (First Embodiment) 
     Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the embodiment, an example of a wristwatch will be described as an example of an electronic apparatus.  FIG. 1  is a block diagram illustrating a configuration of a wristwatch  100  according to the embodiment. The wristwatch  100  is an electronic watch that calculates and displays the cushioning properties of shoes (in particular, running shoes) of a user to calculate the wear degree of the shoes. The cushioning properties of the shoes refer to performance of absorbing shock to the shoes (shock-absorbing properties) and, particularly, refer to buffer power of a midsole. In the example illustrated in the drawing, the wristwatch  100  includes a CPU  101  (wear degree calculating unit, cumulative value calculating unit, cushioning property calculating unit, display control unit), a vibrating unit  102 , an alarm unit  103 , an illumination unit  104 , a body movement detecting unit (measuring unit)  105 , an input unit  106 , a display unit  107 , a memory unit (storing unit)  108 , a power supply unit  109 , and a communication unit  110 . 
     The body movement detecting unit  105  includes an acceleration sensor that detects an acceleration, and measures the number of steps of a user during traveling. Specifically, the body movement detecting unit  105  measures the number of steps of a user during traveling using (Method  1 ) or (Method  2 ).
     (Method  1 ) The body movement detecting unit  105  detects a vertical body vibration during traveling with an acceleration sensor and measures the number of steps of the user during traveling. According to (Method  1 ), the number of steps can be measured with higher accuracy as compared to (Method  2 ).   (Method  2 ) The body movement detecting unit  105  detects a vertical body vibration during traveling with an acceleration sensor, measures the number of steps of the user within a predetermined amount of time (for example, one minute), and measures a traveling pitch (number of steps/min) of the user. The traveling pitch refers to the number of steps per minute. The body movement detecting unit  105  multiplies the measured traveling pitch by a traveling time (unit: min) during which the user travels so as to measure the number of steps of the user during traveling. In this (Method  2 ), the number of steps is measured by the acceleration sensor only within a predetermined amount of time (for example, one minute), and thus the number of steps during the entire period of the traveling time is measured after completion of the traveling of the user. Therefore, in (Method  1 ), it is necessary that the number of steps must be measured by the acceleration sensor while the user travels. However, according to (Method  2 ), it is sufficient that the number of steps is measured by the acceleration sensor only within a predetermined amount of time, and thus a processing load on the wristwatch  100  can be reduced.   

     The CPU  101  controls each unit included in the wristwatch  100 . For example, using a coefficient in consideration of information relating to the user, the CPU  101  converts the number of steps measured by the body movement detecting unit  105  into a wear degree indicating a degree to which shoes of the user are worn out. Examples of the information relating to the user include a body weight of the user, a traveling speed of the user, a running level of the user, and a gender of the user. The traveling speed refers to the running quickness. The running level refers to, for example, an index indicating the time or the running ability of the user when running a predetermined distance. In addition, the CPU  101  reads the cumulative value of the wear degree from the memory unit  108 , and adds the calculated wear degree to the read cumulative value to calculate a new cumulative value of the wear degree. The CPU  101  overwrites the memory unit  108  with the calculated cumulative value of the wear degree as a cumulative value of the wear degree of the shoes. In addition, the CPU  101  calculates cushioning properties of the shoes based on the calculated cumulative value of the wear degree. The CPU  101  displays the calculated cushioning properties of the shoes on the display unit  107 . 
     The vibrating unit  102  generates a reference clock signal for the operation of the CPU  101  or a clock signal for timekeeping. The CPU  101  and the vibrating unit  102  are the timekeeping units for keeping the time. The timekeeping unit realizes a stopwatch function for keeping the traveling time of the user or a clock function for displaying the present clock time. The alarm unit  103  is a sound generating device that generates a check sound or a warning sound. The illumination unit  104  is a backlight that illuminates the display unit  107 . 
     The input unit  106  is configured of a switch capable of being manipulated from the outside and receives an input. For example, the input unit  106  receives an input of the information relating to the user such as the body weight or running level of the user. In addition, the input unit  106  receives an input of an instruction to start the measurement of the number of steps or an input of an instruction to end the measurement of the number of steps. The display unit  107  is, for example, a liquid crystal display and displays the clock time, information relating to the cushioning properties of the shoes of the user, and the like. The memory unit  108  is configured of a ROM (Read Only Memory) or a RAM (Random Access Memory) and stores the cumulative value of the number of steps of the user during traveling or the cumulative value of the wear degree of the shoes of the user. 
     The initial values of the cumulative value of the number of steps and the cumulative value of the wear degree of the shoes are “0”. In addition, the memory unit  108  stores a program which is executed by the CPU  101  in advance. The power supply unit  109  supplies electrical power to each unit included in the wristwatch  100 . The communication unit  110  communicates with other apparatuses. 
     Next, a relationship between the cushioning properties of the shoes and the wear degree thereof will be described. The lower the wear degree of the shoes, the higher the cushioning properties of the shoes, and the higher the wear degree of the shoes, the lower the cushioning properties of the shoes. The lower the amount of usage of the shoes, the lower the wear degree of the shoes, and the higher the amount of usage of the shoes, the higher the wear degree of the shoes. Therefore, the wristwatch  100  according to the embodiment measures the number of steps of the user during traveling as the amount of usage of the shoes and converts the measured number of steps into the wear degree of the shoes. The wristwatch  100  calculates and displays cushioning properties of the shoes based on the converted wear degree. 
     Hereinafter, a method of calculating the wear degree of the shoes will be described. W refers to the cumulative value of the wear degree of the shoes. The wear degree W of the shoes is calculated from the following equation (1).
 
 W =Σ( P )× a×b×c   (1)
 
     However, a, b, and c refer to coefficients in consideration of the information relating to the user. a refers to the coefficient in consideration of the body weight of the user, b refers to the coefficient in consideration of the traveling speed of the user, and c refers to the coefficient in consideration of the running level of the user. 
       FIG. 2  is a graph illustrating a relationship between a load applied to shoes, and the body weight and the traveling speed in the embodiment. In the graph shown in this drawing, the vertical axis represents the load g applied to the shoes, and the horizontal axis represents the traveling speed speed. A curve  301  indicates a relationship between a load applied to shoes, and the body weight and the traveling speed of a heavy-weight user. In addition, a curve  302  indicates a relationship between a load applied to shoes, and the body weight and the traveling speed of a light-weight user. As shown in the drawing, the faster the traveling speed, the higher the load applied to the shoes, and the slower the traveling speed, the lower the load applied to the shoes. Therefore, the faster the traveling speed of the user, the higher the coefficient b in consideration of the traveling speed of the user, and the slower the traveling speed of the user, the lower the coefficient b in consideration of the traveling speed of the user. In addition, as compared to the heavy-weight user (curve  301 ), even at the same traveling speed, the light-weight user (curve  302 ) applies a lower load to the shoes. Therefore, the heavier the body weight of the user, the higher the coefficient a in consideration of the body weight of the user, and the lighter the body weight of the user, the lower the coefficient a in consideration of the body weight of the user. 
       FIG. 3  is a graph illustrating a relationship between the traveling speed and the running level in the embodiment. In the graph shown in this drawing, the vertical axis represents the traveling speed speed, and the horizontal axis represents the running level RunLv. As shown in the drawing, the higher the running level, the faster the traveling speed, and the lower the running level, the slower the traveling speed. Therefore, the higher the running level of the user, the higher the coefficient c in consideration of the running level of the user, and the lower the running level of the user, the lower the coefficient c in consideration of the running level of the user 
     Next, the display content indicating the cushioning properties of the shoes which is displayed on the display unit  107  will be described. 
       FIGS. 4A, 4B, and 4C  are schematic diagrams illustrating the display content indicating the cushioning properties of the shoes which is displayed on the display unit  107  in the embodiment of the present invention. As shown in  FIG. 4A , the display unit  107  displays a bar L indicating the cushioning properties of the shoes along with the present clock time and the battery capacity. In the bar L indicating the cushioning properties of the shoes, a black portion indicates the cushioning properties, and a white portion indicates the wear degree. As shown in  FIG. 4  , in the bar L indicating the cushioning properties of the shoes, in an initial status L 1 , the area of the cushioning properties (black portion) is large, and the area of the wear degree (white portion) is small. Moreover, as the lifetime of the shoes is gradually shortened, the area of the cushioning degree (black portion) is decreased (the area of the wear degree (white portion) is increased). That is, when the black portion of the bar L indicating the cushioning properties of the shoes is decreased (when the white portion is increased) as in a status L 3  where the end of the lifetime is approximately reached after an intelmediate status L 2 , the bar L indicates the state where the end of the lifetime of the shoes is approximately reached. As shown in  FIG. 4C , the bar L may indicate the wear degree of the shoes. Specifically, when the black portion in the bar L indicates the wear degree of the shoes, the wear degree is low in an initial status L 4 . Moreover, as the lifetime of the shoes is gradually shortened, the area of the wear degree is increased. When the black portion indicating the wear degree of the shoes is increased as in a status L 6  end of the lifetime is approximately reached after an intermediate status L 5 , the bar L may indicate the state where the end of the lifetime of the shoes is approximately reached. 
     Next, a cushioning property display process where the wristwatch  100  according to the embodiment displays the cushioning properties of the shoes on the display unit  107  will be described.  FIG. 5  is a flowchart illustrating the procedure of the cushioning property display process which is executed by the wristwatch  100  according to the embodiment. 
     (Step S 101 ) The CPU  101  receives an input of personal information, which is the information relating to the user, from the input unit  106 . The user inputs the personal information by manipulating the input unit  106 . The input personal information described herein is the body weight of the user and the running level or gender of the user. Next, the process proceeds to Step S 102 . 
     (Step S 102 ) The CPU  101  determines whether or not an instruction to start the measurement of the number of steps is input from the input unit  106 . When the instruction to start the measurement is input, the process proceeds to Step S 103 . When the instruction to start the measurement is not input, the process returns to Step S 102 . 
     (Step S 103 ) The CPU  101  starts to keep the time using the stopwatch function. Next, the process proceeds to Step S 104 . 
     (Step S 104 ) The CPU  101  starts to measure the number of steps using the body movement detecting unit  105 . Next, the process proceeds to Step S 105 . 
     (Step S 105 ) The CPU  101  accumulates the number of steps after the start of the measurement. In addition, the CPU  101  calculates the traveling speed by integrating the acceleration detected by the acceleration sensor included in the body movement detecting unit  105 . Next, the process proceeds to Step S 106 . 
     (Step S 106 ) The CPU  101  determines whether or not an instruction to end the measurement of the number of steps is input from the input unit  106 . When the instruction to end the measurement is input, the CPU  101  ends the timekeeping of the stopwatch and the measurement of the number of steps. The process proceeds to Step S 107 . On the other hand, when the instruction to end the measurement is not input, the process returns to Step S 105 . 
     (Step S 107 ) The CPU  101  converts the measured number of steps into the wear degree. Specifically, the CPU  101  determines the coefficient a in consideration of the body weight input in Step S 101 , the coefficient b in consideration of the running level input in Step S 101 , and the coefficient c in consideration of the calculated traveling speed to calculate the wear degree from the above-described equation (1). Next, the process proceeds to Step S 108 . 
     (Step S 108 ) The CPU  101  reads the cumulative value of the wear degree from the memory unit  108 , and adds the calculated wear degree to the read cumulative value to accumulate the wear degree. The CPU  101  writes the memory unit  108  with the accumulated wear degree as a cumulative value of the wear degree. In addition, the CPU  101  adds the calculated number of steps to the cumulative value of the number of steps stored in the memory unit  108 , and the memory unit  108  is overwritten with the obtained value. Next, the process proceeds to Step S 109 . 
     (Step S 109 ) The CPU  101  calculates cushioning properties based on the accumulated wear degree. Next, the process proceeds to Step S 110 . 
     (Step S 110 ) The CPU  101  displays the display content indicating the calculated cushioning properties on the display unit  107 . Specifically, the CPU  101  displays the bar L corresponding to the calculated cushioning properties on the display unit  107 . Next, the cushioning property display process ends. 
     As described above, the wristwatch  100  according to the embodiment converts the number of steps during traveling into the wear degree to obtain a degree to which the shoes are used up, and calculates and displays the cushioning properties, which refer to the function of absorbing shock, based on the accumulated wear degree. As a result, the decrease degree of the cushioning properties of the shoes can be recognized. 
     In addition, in the wristwatch  100  according to the embodiment, not only the number of steps during traveling but also the coefficients in consideration of the information relating to the user such as the body weight, the traveling speed, the running level, and the gender are obtained. Therefore, the decrease degree of the cushioning properties of the shoes corresponding to the characteristics of the user can be recognized with higher accuracy. 
     (Second Embodiment) 
     Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. A wristwatch  100  according to this embodiment has the same configuration as that of the wristwatch  100  according to the first embodiment. This embodiment has a difference from the first embodiment, in that the memory unit  108  includes a nonvolatile memory; and the nonvolatile memory stores the cumulative value of the number of steps and the cumulative value of the wear degree. In addition, the CPU  101  transmits the cumulative value of the number of steps and the cumulative value of the wear degree, which are written on the nonvolatile memory, to an external apparatus such as a computer through the communication unit  110 . As a result, the cumulative value of the number of steps and the cumulative value of the wear degree can be backed up onto the external apparatus. 
     Hereinafter, a cushioning property display process where the wristwatch  100  according to the embodiment displays the cushioning properties of the shoes on the display unit  107  will be described.  FIG. 6  is a flowchart illustrating the procedure of the cushioning property display process which is executed by the wristwatch  100  according to the embodiment. 
     Since the processes of Step S 201  to Step S 208  are the same as the above-described processes of Step S 101  to Step S 108 , the description thereof will be omitted. 
     (Step S 209 ) After Step S 208 , the CPU  101  writes the nonvolatile memory of the memory unit  108  with the cumulative value of the wear degree and the cumulative value of the number of steps. Next, the process proceeds to Step S 210 . 
     (Step S 210 ) The CPU  101  transmits the cumulative value of the wear degree and the cumulative value of the number of steps to the external apparatus through the communication unit  110 . Next, the process proceeds to Step S 211 . 
     Since the processes of Step S 211  to Step S 212  are the same as the above-described processes of Step S 109  to Step S 110 , the description thereof will be omitted. 
     As described above, in the embodiment, the CPU  101  writes the nonvolatile memory of the memory unit  108  with the cumulative value of the wear degree calculated and the cumulative value of the number of steps. As a result, when a battery of the wristwatch  100  is exchanged, data relating to the cumulative value of the wear degree and the cumulative value of the number of steps can be prevented from being erased. 
     In addition, in the embodiment, the CPU  101  transmits the cumulative value of the wear degree and the cumulative value of the number of steps to the external apparatus through the communication unit  110 . As a result, the cumulative value of the wear degree and the cumulative value of the number of steps can be backed up to the external apparatus. In addition, in the external apparatus, the cushioning properties can be calculated from the cumulative value of the wear degree and displayed. 
     (Third Embodiment) 
     Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. A wristwatch  100  according to this embodiment has the same configuration as that of the wristwatch  100  according to the first embodiment. This embodiment has a difference from the first embodiment, in that the cumulative value of the number of steps and the cumulative value of the wear degree can be initialized. The input unit  106  receives an input of an instruction to initialize data relating to the wear degree. When an instruction to initialize the data relating to the wear degree is input from the input unit  106 , the CPU  101  (initializing unit) deletes and initializes the cumulative value of the number of steps and the cumulative value of the wear degree stored in the memory unit  108 . That is, when the instruction to initialize the data relating to the wear degree is input, the CPU  101  sets the cumulative value of the number of steps and the cumulative value of the wear degree, stored in the memory unit  108 , as 0. 
     Hereinafter, an initialization process where the wristwatch  100  according to the embodiment initializes the data relating to the wear degree of the shoes will be described.  FIG. 7  is a flowchart illustrating the procedure of the initialization process which is executed by the wristwatch  100  according to the embodiment. 
     (Step S 301 ) The CPU  101  receives an input of an instruction to initialize the data relating to the wear degree of the shoes from the input unit  106 . The user inputs the instruction to initialize the data relating to the wear degree by manipulating the input unit  106 . Next, the process proceeds to Step S 302 . 
     (Step S 302 ) The CPU  101  deletes the cumulative value of the number of steps and the cumulative value of the wear degree, which are stored in the memory unit  108 , to initialize the cumulative value of the number of steps and the cumulative value of the wear degree. Next, the initialization process ends. 
     As described above, in the embodiment, when the instruction to initialize the data relating to the wear degree of the shoes is input from the input unit  106 , the CPU  101  initializes the cumulative value of the number of steps and the cumulative value of the wear degree. As a result, for example, when the user changes the shoes, data can be initialized. 
     (Fourth Embodiment) 
     Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. A wristwatch  100  according to this embodiment has the same configuration as that of the wristwatch  100  according to the first embodiment. This embodiment has a difference from the first embodiment, in that the cushioning properties are calculated and displayed for each pair of shoes of the user. The input unit  106  (select unit) receives an input of the selection of shoes. For example, the user selects a pair of shoes from among plural pairs of shoes displayed on the display unit  107 . The memory unit  108  stores the cumulative value of the number of steps and the cumulative value of the wear degree for each pair of shoes of the user. Specifically, the memory unit  108  includes plural memories, and each memory stores the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes. That is, the memory unit  108  includes the memories corresponding to the plural pair of shoes, respectively. For example, in the memory unit  108 , a memory A stores the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes A, and a memory B stores of the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes B. The CPU  101  calculates the cushioning properties of the shoes selected by the input unit  106  and displays the calculated cushioning properties of the shoes on the display unit  107 . 
     Hereinafter, a cushioning property display process where the wristwatch  100  according to the embodiment displays the cushioning properties of the shoes on the display unit  107  will be described.  FIG. 8  is a flowchart illustrating the procedure of the cushioning property display process which is executed by the wristwatch  100  according to the embodiment. 
     (Step S 401 ) The CPU  101  receives an input of personal information, which is the information relating to the user, from the input unit  106 . The user inputs the personal information by manipulating the input unit  106 . The input personal information described herein is the body weight of the user and the running level or gender of the user. Next, the process proceeds to Step S 402 . 
     (Step S 402 ) The CPU  101  receives an input of the selection of shoes from the input unit  106 . Next, the process proceeds to Step S 403 . 
     Since the processes of Step S 403  to Step S 408  are the same as the above-described processes of Step S 102  to Step S 107 , the description thereof will be omitted. 
     (Step S 409 ) After Step S 408 , the CPU  101  reads the cumulative value of the wear degree, which corresponds to the shoes selected in Step S 402 , from the memory unit  108 , and adds the calculated wear degree to the read cumulative value to accumulate the wear degree. The CPU  101  writes the memory unit  108  with the accumulated wear degree as a cumulative value of the wear degree of the shoes selected in Step S 402 . In addition, the CPU  101  reads the cumulative value of the number of steps, which corresponds to the shoes selected in Step S 402 , from the memory unit  108 , and adds the measured number of steps to the read cumulative value to overwrite the memory unit  108 . Next, the process proceeds to Step S 410 . 
     (Step S 410 ) The CPU  101  calculates the cushioning properties of the shoes selected in Step S 402  based on the accumulated wear degree. Next, the process proceeds to Step S 411 . 
     (Step S 411 ) The CPU  101  displays the display content indicating the calculated cushioning properties on the display unit  107 . Next, the cushioning property display process ends. 
     As described above, in the embodiment, the input unit  106  receives an input of the selection of shoes. In addition, the CPU  101  calculates and displays the cushioning properties of the selected shoes. As a result, when the user uses plural pairs of shoes, the cushioning properties can be calculated and displayed for each pair of shoes of the user. 
     (Fifth Embodiment) 
     Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings. A wristwatch  100  according to this embodiment has the same configuration as that of the wristwatch  100  according to the first embodiment. This embodiment has a difference from the first embodiment, in that the cushioning properties are calculated and displayed for each pair of shoes of the user. In the fourth embodiment, the user inputs shoes to be used. However, in this embodiment, the wristwatch  100  automatically determines the currently-used shoes of the user based on the traveling speed of the user. The memory unit  108  stores the cumulative value of the wear degree for each pair of shoes of the user. Specifically, the memory unit  108  includes plural memories, and each memory stores the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes. That is, the memory unit  108  includes the memories corresponding to the plural pair of shoes, respectively. For example, in the memory unit  108 , a memory A stores the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes A, and a memory B stores of the cumulative value of the number of steps and the cumulative value of the wear degree corresponding to a pair of shoes The memory unit  108  stores the range of the traveling speed for each pair of shoes of the user. For example, the memory unit  108  stores “speed×per hour or slower” as the range of the traveling speed corresponding to shoes for a practice, and stores “speed×per hour or faster” as the range of the traveling speed corresponding to shoes for a race. The CPU  101  calculates the traveling speed of the user by integrating the acceleration detected by the acceleration sensor included in the body movement detecting unit  105 . The CPU  101  (select unit) reads shoes, which correspond to the calculated traveling speed, from the memory unit  108  and selects the read shoes as the currently-used shoes of the user. 
     Hereinafter, a cushioning property display process where the wristwatch  100  according to the embodiment displays the cushioning properties of the shoes on the display unit  107  will be described.  FIG. 9  is a flowchart illustrating the procedure of the cushioning property display process which is executed by the wristwatch  100  according to the embodiment. 
     Since the processes of Step S 501  to Step S 505  are the same as the above-described processes of Step S 101  to Step S 105 , the description thereof will be omitted. 
     (Step S 506 ) After Step S 505 , the CPU  101  calculates the traveling speed of the user by integrating the acceleration detected by the acceleration sensor included in the body movement detecting unit  105 . Next, the process proceeds to Step S 507 . 
     (Step S 507 ) The CPU  101  determines whether or not an instruction to end the measurement of the number of steps is input from the input unit  106 . When the instruction to end the measurement is input, the CPU  101  ends the timekeeping of the stopwatch and the measurement of the number of steps. The process proceeds to Step S 508 . On the other hand, when the instruction to end the measurement is not input, the process returns to Step S 505 . 
     (Step S 508 ) The CPU  101  converts the measured number of steps into the wear degree. A method of converting the number of steps into the wear degree is the same as in the first embodiment. Next, the process proceeds to Step S 509 . 
     (Step S 509 ) The CPU  101 . calculates an average value of the traveling speed calculated in Step S 506 . Next, the process proceeds to Step S 510 . 
     (Step S 510 ) The CPU  101  reads shoes, which correspond to the average value of the traveling speed, from the memory unit  108  and selects the read shoes as the currently-used shoes of the user. Next, the process proceeds to Step S 511 . 
     (Step S 511 ) The CPU  101  reads the cumulative value of the wear degree, which corresponds to the shoes selected in Step S 510 , from the memory unit  108 , and adds the calculated wear degree to the read cumulative value to accumulate the wear degree. The CPU  101  writes the memory unit  108  with the accumulated wear degree as a cumulative value of the wear degree of the shoes selected in Step S 510 . In addition, the CPU  101  reads the cumulative value of the number of steps, which corresponds to the shoes selected in Step S 510 , from the memory unit  108 , and adds the measured number of steps to the read cumulative value to overwrite the memory unit  108 . Next, the process proceeds to Step S 512 . 
     (Step S 512 ) The CPU  101  calculates the cushioning properties of the shoes selected in Step S 510  based on the accumulated wear degree. Next, the process proceeds to Step S 513 . 
     (Step S 513 ) The CPU  101  displays the display content indicating the calculated cushioning properties on the display unit  107 . Next, the cushioning property display process ends. 
     As described above, in the embodiment, the CPU  101  automatically determines the currently-used shoes of the user based on the traveling speed of the user, and calculates and displays the determined cushioning properties of the shoes. As a result, when the user uses plural pairs of shoes, the cushioning properties can be calculated and displayed for each pair of shoes of the user. In addition, since the currently-used shoes of the user are automatically determined, it is not necessary that the user directly input the selection of shoes. 
     (Sixth Embodiment) 
     Hereinafter, a sixth embodiment of the present invention will be described with reference to the drawings. A wristwatch  100  according to this embodiment has the same configuration as that of the wristwatch  100  according to the first embodiment. This embodiment has a difference from the first embodiment, in that, when a replacement period of the shoes is reached (that is, when the cushioning properties of the shoes approximately reach the limit), the CPU  101  causes a warning to be lighted on the display unit  107 . Specifically, when the cumulative value of the wear degree is a predetermined threshold value α or higher, the CPU  101  determines that the replacement period of the shoes is reached and causes a warning to be lighted on the display unit  107 . 
     Hereinafter, a cushioning property display process where the wristwatch  100  according to the embodiment displays the cushioning properties of the shoes on the display unit  107  will be described.  FIG. 10  is a flowchart illustrating the procedure of the cushioning property display process which is executed by the wristwatch  100  according to the embodiment. 
     Since the processes of Step S 601  to Step S 608  are the same as the above-described processes of Step S 101  to Step S 108 , the description thereof will be omitted. 
     (Step S 609 ) After Step S 608 , the CPU  101  compares the cumulative value of the wear degree to the predetermined threshold value α. When the cumulative value of the wear degree is the threshold value α or higher, the process proceeds to Step S 610 . When the cumulative value of the wear degree is lower than the threshold value α, the process proceeds to Step S 611 . 
     (Step S 610 ) The CPU  101  causes a warning mark to be lighted on the display unit  107 , in which the warning mark indicates that the cushioning properties of the currently-used shoes of the user reach the limit and indicates the replacement period of the shoes. Next, the process proceeds to Step S 611 . 
     Since the processes of Step  611  to Step S 612  are the same as the above-described processes of Step S 109  to Step S 110 , the description thereof will be omitted. 
     In the embodiment, the CPU  101  causes the warning to be lighted on the display unit  107 . However, the present invention is not limited to this configuration as long as the user can be notified that the cushioning properties of the shoes reach the limit. For example, the message “please buy and replace new shoes” may be displayed on the display unit  107 , or a warning sound may be output from the alarm unit  103 . 
     As described above, in the embodiment, when the replacement period of the shoes is reached, the CPU  101  displays the warning on the display unit  107 . As a result, the user recognizes that the cushioning properties of the shoes reach the limit and recognizes that the shoes should be bought and replaced. 
     A part or all of the functions of the respective units included in the wristwatches  100  according to the first embodiment to the sixth embodiment described above may be realized by recording a program for realizing these functions on a computer-readable recording medium and causing a computer system to read and execute this program recorded on the recording medium. The “computer system” described herein includes OS and hardware such as peripheral devices. 
     In addition, the “computer-readable recording medium” includes portable mediums such as a flexible disc, a magneto-optic disc, a ROM, and a CD-ROM; and storages such as a hard disc built into a computer system. Further, the “computer-readable recording medium” may include the following mediums: mediums on which a program is dynamically stored for a short period of time, for example, a network such as the Internet or a communication line such as a telephone line through which a program is transmitted; and mediums on which a program is stored for a predetermined amount of time, for example, a volatile memory which is built into a computer system functioning as a server or a client. In addition, the program may realize a part of the above-described functions or may realize the above-described functions in combination with a program stored in a computer system in advance. 
     Hereinabove, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications can be added within a range not departing from the scope of the present invention. 
     For example, in the above-described embodiments, the CPU  101  causes the cushioning properties of the shoes to be displayed by graphics. However, the present invention is not limited to this configuration as long as the content which allows the user to check the cushioning properties of the shoes is displayed. For example, the CPU  101  may cause the cushioning properties of the shoes to be displayed on the display unit  107  in percentage. Alternatively, the CPU  101  may cause the cushioning properties of the shoes to be displayed on the display unit  107  by target display (comfortable/limit). In this case, in the CPU  101 , a case where the cushioning properties of the shoes are a predetermined threshold value β or higher is evaluated as “comfortable”, and a case where the cushioning properties of the shoes are lower than the predetermined threshold value β is evaluated as “limit”. Alternatively, the CPU  101  may cause the cushioning properties of the shoes to be displayed on the display unit  107  by an animation or a graph. 
     In addition, in the above-described embodiments, the CPU  101  converts the number of steps into the wear degree using the coefficient a in consideration of the body weight of the user, the coefficient b in consideration of the traveling speed of the user, and the coefficient c in consideration of the running level of the user. However, the present invention is not limited to this configuration, but the CPU  101  may convert the number of steps into the wear degree using one or two or more of the above-described coefficients a and b. 
     Alternatively, the CPU  101  may convert the number of steps into the wear degree without using the coefficients in consideration of the information relating to the user. 
     In addition, in the above-described embodiments, the information relating to the user has been described using the body weight, the traveling speed, and the running level as an example, but the present invention is not limited thereto. For example, the CPU  101  may convert the number of steps into the wear degree using coefficients in consideration of information relating to other users such as gender, characteristics of shoes, or a traveling pitch. 
     In addition, in the above-described embodiments, the wristwatch  100  has been described as an example of the electronic apparatus, but the present invention is not limited thereto. For example, the electronic apparatus may be any of a mobile phone, a smartphone, a pedometer, and the like as long as it can be carried by the user during traveling. 
     In addition, in the above-described embodiments, the acceleration sensor for measuring the number of steps of the user is built into the wristwatch  100 , but the present invention is not limited thereto. The acceleration sensor may be mounted at a position at which the number of steps of the user can be measured.  FIGS. 11A, 11B, and 11C  are diagrams illustrating examples of mounting positions of the acceleration sensor C for measuring the number of steps of the user. 
     In the example shown in  FIG. 11A , the acceleration sensor C for measuring the number of steps of the user is built into the wristwatch  100 . As a result, the wear degree of the shoes can be calculated without contact between the acceleration sensor C and the shoes of the user. In addition, when the user replaces the shoes, it is not necessary that the acceleration sensor C be mounted on another mounting position. In addition, when the acceleration sensor C is built into a midsole of the shoes, the cushioning properties of the midsole may deteriorate. However, deterioration in the cushioning properties of the midsole can be prevented by mounting the acceleration sensor C on the wristwatch  100 . 
     In addition, in the above-described embodiments, the acceleration sensor detects the vertical body vibration of the user to measure the number of steps, but the present invention is not limited thereto. For example, the acceleration sensor may detect a vibration of arm swinging of the user to measure the number of steps. The vibration of the arm swinging of the user refers to the vibration generated when the arms of the user move back and forth, 
     In addition, in the above-described embodiments, the cumulative value of the number of steps and the cumulative value of the wear degree can be initialized. However, the cumulative value of the number of steps and the cumulative value of the wear degree may be changed to arbitrary values instead of being initialized. For example, an instruction to change the cumulative values to arbitrary values may be received through a manipulation from the input unit  106 . As a result, when initially using the electronic apparatus according to the embodiment, the user can set the cumulative values so as to match the wear state of the shoes used. 
     In an example shown in  FIG. 11B , the acceleration sensor C for measuring the number of steps of the user is built into a peripheral apparatus which is mountable on the outside of the shoes (for example, a shoelace) This peripheral apparatus can wirelessly communicate with the wristwatch  100  and transmits the acceleration detected by the acceleration sensor C to the wristwatch  100 . By mounting the acceleration sensor C on the peripheral apparatus, the acceleration sensor C can be easily mounted on another mounting position when the user replaces the shoes. 
     In the example shown in  FIG. 11C , the acceleration sensor C for measuring the number of steps of a user is built into the shoes of the user. The mounting position of the acceleration sensor C is a midsole of the shoes. The communication unit is built into the midsole so as to wirelessly transmit the acceleration detected by the acceleration sensor C to the wristwatch  100 . By mounting the acceleration sensor C on the shoes, the accuracy of the pedometer can be improved. In addition, it is not necessary to install the acceleration sensor C. Instead of the acceleration sensor C, a piezoelectric element for measuring the number of steps of the user may be built into the midsole of the shoes. 
       FIG. 12  is a diagram illustrating an example of a method of measuring the number of steps using the acceleration sensor. As shown in this drawing, examples of the method of measuring the number of steps using the acceleration sensor include a method of detecting a vertical direction  1301  of the user; and a method of detecting a vibration  1302  of arm swinging of the user. In the method of detecting the vertical body vibration  1301  of the user, when detecting the vertical body vibration  1301  of the user once, the body movement detecting unit  105  increases the number of steps by one. That is, in the method of detecting the vertical body vibration  1301  of the user, the cycle of the vibration and the number of steps are synchronized with each other. 
     On the other hand, in the method of detecting the vibration  1302  of arm swinging of the user, when detecting the vibration  1302  of arm swinging of the user once, the body movement detecting unit  105  increases the number of steps by two. That is, in the method of detecting the vibration  1302  of arm swinging of the user, the cycle of the vibration is ½ of the number of steps. 
     For example, when the acceleration sensor is built into the wristwatch  100 , the number of steps of the user can be detected using any of the method of detecting the vertical body vibration  1301  of the user; and the method of detecting the vibration  1302  of arm swinging of the user. On the other hand, when the acceleration sensor is mounted on the peripheral apparatus or the shoes, the method of detecting the vertical vibration  1301  of the user is preferably used. 
     REFERENCE SYMBOL LIST 
       100  WRISTWATCH 
       101  CPU 
       102  VIBRATING UNIT 
       103  ALARM UNIT 
       104  ILLUMINATION UNIT 
       105  BODY MOVEMENT DETECTING UNIT 
       106  INPUT UNIT 
       107  DISPLAY UNIT 
       108  MEMORY UNIT 
       109  POWER SUPPLY UNIT 
       110  COMMUNICATION UNIT