Information processing apparatus, information processing method, information processing program, and recording medium

An information processing apparatus comprising:

• a threshold value determination unit that determines a threshold value of a number of times of use of a keyword on the basis of the number of times of use of the keyword in each of unit periods included in a cycle period;
• a candidate identification unit that identifies at least one period as a candidate for a popularity period in which the keyword is popular, the candidate being included in the cycle period and being a period in which the numbers of times of use exceeds the threshold value determined by the threshold value determination unit;
• and
• a period determination unit that, when any of the at least one period identified by the candidate identification unit does not satisfy a condition that a situation in which the numbers of times of use in the period identified by the candidate identification unit exceeds the threshold value determined by the threshold value determination unit is different from a situation based on a periodic popularity of the keyword, determines the period not satisfying the condition to be the popularity period.

An information processing method performed by a computer, the method comprising:

• a threshold value determination step of determining a threshold value of a number of times of use of a keyword on the basis of the number of times of use of the keyword in each of unit periods included in a cycle period;
• a candidate identification step of identifying at least one period as a candidate for a popularity period in which the keyword is popular, the candidate being included in the cycle period and being a period in which the numbers of times of use exceeds the threshold value determined in the threshold value determination step;
• and
• a period determination step of, when any of the at least one period identified in the candidate identification step does not satisfy a condition that a situation in which the numbers of times of use in the period identified in the candidate identification step exceeds the threshold value determined in the threshold value determination step is different from a situation based on a periodic popularity of the keyword, determining the period not satisfying the condition to be the popularity period.