Instant message analytics of historical conversations in relation to present communication

An evaluation system that evaluates a delivered video using a marker, the evaluation system comprising:

• a processor;
• and
• a storage device comprising:
• a marker generation unit that, to evaluate the video, generates a marker to be superimposed and displayed on an evaluation range in the video from coordinate values specifying the evaluation range input, the marker generation unit adding the marker to the video and causing the video with the marker to be delivered for presentation;
• an image generation unit that generates an image in the evaluation range at predetermined intervals starting from the input time of the coordinate values;
• a determination unit that calculates a similarity between two images arranged in the order of time from the input time by comparing the two images and determining whether the similarity is within an allowable range;
• a decision unit that decides the time of one of the two image generated as an extinction time of the displayed marker in the case where the similarity is determined to be not within the allowable range;
• a clustering unit that clusters evaluation objects, which include the coordinate values, the input time, and the extinction time as feature values, by using the feature values;
• and
• a calculation unit that calculates the averages of the feature values included in the evaluation objects clustered in the same cluster, wherein:
• the clustering unit performs clustering for each evaluation level allocated according to an evaluation content included in the evaluation object;
• the evaluation objects include evaluation points, respectively;
• the calculation unit calculates an attention degree by calculating an average of the evaluation points included in the evaluation objects clustered in the same cluster for each evaluation level and dividing the average of the evaluation points by a total evaluation point included in all clusters;
• the marker generation unit generates the marker by using the average for the evaluation level, changes the marker according to the attention degree, adds the changed marker to the video, and causes the video with the marker to be delivered, in response to a request for displaying an evaluation result of a plurality of users for a specified evaluation level.