A relay apparatus includes a storage, and request data reception and transmission units, first and second conversion units, and content identifier reception and transmission units. For each storage service, the storage stores a service identifier, access destination information, and a conversion routine for converting a content identifier and a specified condition for specifying content between a server format and a client apparatus format. The request data reception unit receives a service identifier and a specified condition from a client apparatus. The first conversion unit converts the specified condition into a server format. The request data transmission unit transmits the resulting specified condition according to the access destination information. The content identifier reception unit receives a content identifier from a server. The second conversion unit converts the received content identifier into the client apparatus format. The content identifier transmission unit transmits the resulting content identifier to the client apparatus.