Abstract: A method of selecting a target candidate among user devices to which an advertisement content is provided including: receiving, by a data receiving unit of a first server from each user device, a unique data including device identification information and application information of each application installed in the user device; confirming, by the first server for each user device, the application installed in the user device from the unique data; applying, by the first server for each user device, an application weight to each application installed in the user device, the application weight being different for each application; summing, by the first server for each user device, the application weights applied to each installed application, and calculating a score of the user device based on the sum of the application weights; and selecting at least one of the user devices as the target candidate based on the score.

Abstract: Provided are a system and method for determining rankings of keywords according to a user group. The keyword ranking determining system includes a data grouping unit to group data of a weblog according to a predetermined theme, a weight application unit to calculate a document concentration that denotes a concentration degree, with respect to the theme, of a document corresponding to the data grouped according to the theme and to apply a weight corresponding to the document concentration to the data, a data set generation unit to generate at least one data set by grouping the data applied with the weight according to a search intention and a ranking determination unit to determine rankings of the at least one data set according to the theme, and a main keyword determination unit to determine a main keyword representing each of the at least one data set.

Abstract: Provided are a system and method for determining rankings of keywords according to a user group. The keyword ranking determining system includes a data grouping unit to group data of a weblog according to a predetermined theme, a weight application unit to calculate a document concentration that denotes a concentration degree, with respect to the theme, of a document corresponding to the data grouped according to the theme and to apply a weight corresponding to the document concentration to the data, a data set generation unit to generate at least one data set by grouping the data applied with the weight according to a search intention and a ranking determination unit to determine rankings of the at least one data set according to the theme, and a main keyword determination unit to determine a main keyword representing each of the at least one data set.