1. An information processing device comprising:
a morphological analysis unit performing morphological analysis to divide each of an article body text included in an article and a caption of each of images into morphemes;
a phrase acquiring unit dividing the article body text into phrases on a basis of a result of the morphological analysis performed by the morphological analysis unit; and
a correspondence determining unit determining correspondence between each of the phrases of the article body text and the images by calculating a correlation between the caption and each of the phrases of the article body text on a basis of the result of the morphological analysis performed by the morphological analysis unit.
2. The information processing device according to claim 1,
further comprising: a caption abstracting unit generating a
caption abstract by abstracting the caption,
wherein the correspondence determining unit determines correspondence between each of the phrases of the article body text and the images by calculating a correlation between the caption abstract and each of the phrases of the article body text.
3. The information processing device according to claim 1,
further comprising: a dependency analysis unit dividing the
article body text into meaningful chunks by acquiring a
dependency relation between the phrases of the article body
text,
wherein the correspondence determining unit determines correspondence between each of the meaningful chunks of the article body text and the images by calculating a correlation between the caption and each of the meaningful chunks of the article body text.
4. The information processing device according to claim 3,
further comprising: a caption abstracting unit generating a
caption abstract by abstracting the caption,

wherein the correspondence determining unit determines correspondence between each of the meaningful chunks of the article body text and the images by calculating a correlation between the caption abstract and each of the meaningful chunks of the article body text.
5. The information processing device according to claim 1,
further comprising: a body text abstracting unit generating an
article body text abstract by abstracting the article body text,
wherein the correspondence determining unit determines correspondence between each of the phrases included in the article body text abstract and the images by calculating a correlation between the caption and each of phrases included in the article body text abstract.
6. The information processing device according to claim 5,
further comprising: a caption abstracting unit generating a
caption abstract by abstracting the caption,
wherein the correspondence determining unit determines correspondence between each of the phrases included in the article body text abstract and the image by calculating a correlation between the caption abstract and each of the phrases included in the article body text abstract.
7. The information processing device according to claim 6, wherein the caption abstracting unit generates the caption abstract to include the article body text abstract.
8. The information processing device according to claim 1, further comprising: a second correspondence determining unit, which, when there are multiple images each having correspondence with a sentence chunk including one or more sentences in the article body text, acquires a significance degree of each of phrases of the article body text or a significance degree of each of meaningful chunks of the article body text on a basis of word significance degree information showing a significance degree of each word, and determines an image corresponding to a phrase or a meaningful chunk having a highest significance degree in the sentence chunk, as an image

having correspondence with the sentence chunk.
9. The information processing device according to claim 1, wherein the article body text is a character string acquired by performing voice recognition on voice data.
10. An information processing method comprising:
by a morphological analysis unit, performing morphological analysis to divide each of an article body text included in an article and a caption of each of images into morphemes;
by a phrase acquiring unit, dividing the article body text into phrases on a basis of a result of the morphological analysis performed by the morphological analysis unit; and
by a correspondence determining unit, determining correspondence between each of the phrases of the article body text and the image by calculating a correlation between the caption and each of the phrases of the article body text on a basis of the result of the morphological analysis performed by the morphological analysis unit.