Methods and systems for determining ranking of dialogue sticker based on situation and preference information

A non-transitory computer readable medium storing instructions for recommending a dialogue sticker by use of a server that is connected to a first user terminal and a second user terminal through a network and relays an utterance inputted to a messenger between the first user terminal and the second user terminal, the utterance including at least one of a text and an image, wherein execution of the instructions by a computing device causes the computing device to perform the steps of:

• analyzing a dialogue situation from utterances between the first user terminal and the second user terminal;
• selecting a sticker candidate group by retrieving a dialogue situation similar to the analyzed dialogue situation from utterance data;
• calculating, based on preference, an expression suitability for each sticker of the selected sticker candidate group;
• and
• ranking the stickers in the selected sticker candidate group based on the expression suitability;
• and
• recommending a highest ranked sticker on a display device of the first user terminal,
• wherein the step of calculating an expression suitability comprises calculating a distance between an expression preference vector of a first user of the first user terminal and an expression vector for each sticker of the selected sticker candidate group, and
• wherein the expression vector for a sticker has multiple elements and each element of the expression vector has a value that indicates the first user's preference on the sticker in association with a type of expression.