Determining matching degrees of information categories and displayed information is disclosed. In some embodiments, recorded user selection action information with respect to displayed information is analyzed to determine which pieces of displayed information have been selected and which pieces were displayed but not selected. In some embodiments, a matching degree for an information category is determined based on the recorded user selection information with respect to displayed information. In some embodiments, based on this matching degree determined for the information category, it is determined whether the information to be displayed for the information category is to be adjusted for a subsequent event in which information of the information category is to be displayed.