Patent ID: 7065519

Claim:
A computer-readable medium for recording a program for searching individually a first content group stored in a first storage unit and a second content group in a second storage unit which contains similar content as the first content group, wherein the program causes a computer to execute the processes of: searching the first content group stored in the first storage unit using inputted search conditions; displaying a list of identification information of retrieved content as search results of the first content group; obtaining the identification information corresponding to content selected by a user from the search results of the first content group and storing the obtained identification information in a reference history storage unit; searching the second content group stored in the second storage unit using the inputted search conditions; obtaining identification information corresponding to retrieved content as search results of the second content group and determining whether or not the identification information corresponding to the content retrieved from the second content group exists in the reference history storage unit; distinguishing the identification information which exists in the reference history storage unit from the identification information which does not exist in the reference history storage unit: and displaying the identification information of the content retrieved from the second content group as search results so that the content having the identification information stored in the reference history storage unit is distinguished from the content not having the identification information stored in the reference history storage unit.