1. An information processing device, comprising: feature amount extracting means for extracting an image feature amount of each frame of an image of learning content and extracting word frequency information regarding frequency of appearance of each word in a description text describing a content of the image of the learning content as a text feature amount of the description text; and model learning means for learning an annotation model, which is a multi-stream HMM (hidden Markov model), by using an annotation sequence for annotation, which is a multi-stream including the image feature amount and the text feature amount.