Mobile electronic apparatus, danger notifying method, and medium for storing program

1. A mobile electronic apparatus comprising:

a memory that stores a search range distance; and

a processor that executes a process including:

determining whether a user of the mobile electronic apparatus is walking,

acquiring a moving speed of the mobile electronic apparatus when the user is determined to be walking, wherein acquiring the moving speed includes:

acquiring an activity intensity of a user of the mobile electronic apparatus on a basis of a value which is metered by an acceleration meter in the mobile electronic apparatus, and

converting the activity intensity into the moving speed on a basis of a predetermined relation between the activity intensity and the moving speed;

determining the search range distance on a basis of the moving speed, wherein determining the search range distance includes determining a distance corresponding to the moving speed acquired in the acquiring on a basis of a predetermined relation between the moving speed and the distance for specifying the search range;

detecting an object existing within the search range distance, wherein detecting the object existing within the search range distance includes comparing a value, which is metered by a distance meter in the mobile electronic apparatus, to the distance determined in the determining the search range distance;

detecting whether a display unit of the mobile electronic apparatus is in an active state; and

notifying that the object is detected in response to the display unit being detected to be in the active state and in response to the object existing within the search range distance being detected.

2. The mobile electronic apparatus according to claim 1 , the process further comprising:

determining whether a user of the mobile electronic apparatus is walking,

wherein the notifying notifies that the object is detected when the user is determined to be walking.

3. The mobile electronic apparatus according to claim 1 , wherein

the acquiring a moving speed acquires the moving speed when the display unit is detected to be in the active state.

4. The mobile electronic apparatus according to claim 1 , wherein

the determining the search range distance determines the search range distance when the display unit is detected to be in the active state.

5. A danger notifying method which is used in a mobile electronic apparatus, the method comprising:

determining whether a user of the mobile electronic apparatus is walking,

acquiring a moving speed of the mobile electronic apparatus when the user is determined to be walking, wherein acquiring the moving speed includes:

acquiring an activity intensity of a user of the mobile electronic apparatus on a basis of a value which is metered by an acceleration meter in the mobile electronic apparatus, and

converting the activity intensity into the moving speed on a basis of a predetermined relation between the activity intensity and the moving speed;

determining a search range distance on a basis of the moving speed, wherein determining the search range distance includes determining a distance corresponding to the moving speed acquired in the acquiring on a basis of a predetermined relation between the moving speed and the distance for specifying the search range;

detecting an object existing within the search range distance, wherein detecting the object existing within the search range distance includes comparing a value, which is metered by a distance meter in the mobile electronic apparatus, to the distance determined in the determining the search range distance;

detecting, using a processor, that a display unit of the mobile electronic apparatus is in an active state; and

notifying that the object is detected in response to the display unit being detected to be in the active state and in response to the object existing within the search range distance being detected.

6. A non-transitory computer readable recording medium for storing a program causing a mobile electronic apparatus to execute a process, the process comprising:

determining whether a user of the mobile electronic apparatus is walking,

acquiring a moving speed of the mobile electronic apparatus when the user is determined to be walking, wherein acquiring the moving speed includes:

acquiring an activity intensity of a user of the mobile electronic apparatus on a basis of a value which is metered by an acceleration meter in the mobile electronic apparatus, and

converting the activity intensity into the moving speed on a basis of a predetermined relation between the activity intensity and the moving speed;

determining a search range distance on a basis of the moving speed, wherein determining the search range distance includes determining a distance corresponding to the moving speed acquired in the acquiring on a basis of a predetermined relation between the moving speed and the distance for specifying the search range;

detecting an object existing within the search range distance, wherein detecting the object existing within the search range distance includes comparing a value, which is metered by a distance meter in the mobile electronic apparatus, to the distance determined in the determining the search range distance;

detecting, using a processor, that a display unit of the mobile electronic apparatus is in an active state; and

notifying that the object is detected in response to the display unit being detected to be in the active state and in response to the object existing within the search range distance being detected.