Abstract: According to an aspect of the present invention, there is provided a method for controlling a flow of advertising contents on the basis of a video chat, the method including measuring a positive response level of at least one talker among two or more talkers about an advertising content being provided to the two or more talkers on the basis of information on interaction among the two or more talkers participating in a video chat, and dynamically controlling a flow of advertising contents to be provided to the at least one talker on the basis of the positive response level.

Abstract: According to an aspect of the present invention, there is provided a method for estimating an emotion about an advertising content on the basis of a video chat, the method including providing an advertising content to at least one talker participating in the video chat, estimating an emotion of the at least one talker about the advertising content on the basis of at least one of a facial expression and chat contents of the at least one talker, and verifying whether the estimated emotion relates to the advertising content on the basis of gaze information of the at least one talker.

Abstract: A method for a multilateral communication service includes acquiring at least one of a first video taken in a device of a first user, a first voice recorded in the device of the first user, and a first text message entered in the device of the first user; and specifying a plurality of display areas respectively assigned to a plurality of users participating in a conversation, and dynamically providing at least one of the first video, the first voice, and the first text message to a first display area assigned to the first user. When the first video or text message is dynamically provided, the first video or text message is dynamically displayed in the first display area, and when the first text message is dynamically displayed in the first display area, only a text message most recently entered by the first user is displayed in the first display area.

Abstract: A method for a multilateral communication service includes acquiring at least one of a first video taken in a device of a first user, a first voice recorded in the device of the first user, and a first text message entered in the device of the first user; and specifying a plurality of display areas respectively assigned to a plurality of users participating in a conversation, and dynamically providing at least one of the first video, the first voice, and the first text message to a first display area assigned to the first user. When the first video or text message is dynamically provided, the first video or text message is dynamically displayed in the first display area, and when the first text message is dynamically displayed in the first display area, only a text message most recently entered by the first user is displayed in the first display area.