Information processing system, information processing method, and computer program

One or more computer processors include (i) a distribution portion that distributes, to a viewing user terminal, information about a video including an animation of a character object of a distribution user, (ii) a receiver that receives a display request for a specified gift transmitted from the viewing user terminal, (iii) an object display device that displays a specified gift object corresponding to the specified gift in the video, based on the display request received by the receiver, (iv) a determination portion that determines whether behavior information of the distribution user or another gift object satisfies a predetermined condition associated with the specified gift object, and (v) an expression portion that changes at least one of a movement and a shape of the specified gift object when the determination portion determines that the predetermined condition is satisfied.