2. The non-transitory computer-readable recording medium according to claim 1 , further comprising: extracting character information from the video image information included in the music that is received at the receiving; and decomposing the character information extracted at the extracting into words, wherein the associating includes specifying, by referring to a word storing unit which stores the plurality of categories which are stored in the characteristic storing unit and at least one word in an associated manner, a category that is associated with a word.
2. The non-transitory computer-readable recording medium according to claim 1 , further comprising: extracting character information from the video image information included in the music that is received at the receiving; and decomposing the character information extracted at the extracting into words, wherein the associating includes specifying, by referring to a word storing unit which stores the plurality of categories which are stored in the characteristic storing unit and at least one word in an associated manner, a category that is associated with a word. 3. The non-transitory computer-readable recording medium according to claim 2 , wherein the measuring includes measuring appearance frequency with which the word associated with the category appears in the music, and the associating includes associating the category with the appearance frequency.