4. The information processing device according to claim 2 , wherein the one or more processors are configured to add an annotation to target content by using the annotation model.
4. The information processing device according to claim 2 , wherein the one or more processors are configured to add an annotation to target content by using the annotation model. 5. The information processing device according to claim 4 , wherein the one or more processors are configured to: extract words included in the text of the caption displayed in a window as one document while shifting the window of a predetermined time length at regular intervals; extract multinomial distribution, which represents a frequency of appearance of each word in the document, as the text feature amount; extract the image feature amount of each frame of the image of the target content; compose the annotation sequence by using the image feature amount; obtain a maximum likelihood state sequence in which the annotation sequence is observed in the annotation model; and select a word with a highest frequency in the multinomial distribution observed in a state corresponding to a target frame out of states of the maximum likelihood state sequence as the annotation to be added to the target frame.