priority in fig3 the latter keyword is indicated in parentheses as u201c the must win battle u201d allowing the user to know the narrowing down keyword employed for the current y axis display the cursor 525 is located on a post of a tweeter user indicated by a graphic or symbol of a spiral which contains a phrase about the player u201c d u201d namely u201c d who scored a goal u201d therefore posts from the tweeter user of the graphic or symbol of the spiral are now additionally identified and sequentially displayed along the x axis fig5 is a diagram for describing how posts are displayed on the computer screen according to embodiments of the present invention illustrating a state in which the situation has changed from fig4 when u201c d who scored a goal u201d is actually selected by the user 39 s operation the computer narrows down the displayed posts to only posts containing the keyword of u201c d who scored a goal u201d which results in the posts displayed along the y axis changing at the same time for the posts displayed along the x axis the priority may have changed even though the posts are from the same tweeter user this is because posts of the tweeter user indicated by the graphic or symbol of the spiral may have been added due to the lapse of a certain period of time since the situation in fig4 therefore the posts are accordingly displayed along a timeline for the x axis the x axis may also be set as a timeline a setting such that posts are displayed on the computer screen in chronological order along the x axis newer posts.