Hereinafter, with respect to FIG. 18, the method for indicating characteristic of problem set according to one embodiment of the present invention is explained. The explanation will be focused on the difference from the method for indicating characteristic of problem set according to the first embodiment of the present invention. With reference to FIG. 18, a flow chart of the method for indicating characteristic of problem set according to one embodiment of the present invention is depicted.

According to the method for indicating characteristic of problem set according to one embodiment of the present invention, as depicted in FIG. 18, a plurality of attributes, which are for expressing characteristic of problem, can be identified (S10).

However, it should be noted that the attributes defined in this step (S10) are not for expressing characteristic of a specific problem. In this step (S10), a population of attributes can be defined for expressing characteristics of all problems, which can be set as exam problems with respect to a subject or a topic related with those problems. For this, a plurality of attributes can be defined in this step (S10).

Thereafter, with reference to FIG. 18, characteristic of problem can be determined (S20). Specifically, characteristic of problem can be determined by attributes related with the problem and correlations between the attributes.

Thereafter, with reference to FIG. 18, determined characteristic of problem can be visualized on a screen (S50). For this, various technologies which can be used in visualizing (S40) determined characteristic of problem set on a screen.