An operation apparatus includes a communication section to communicate with an electronic apparatus capable of communicating, through a first transmission medium, with an accumulation apparatus capable of accumulating contents, the communication section communicating with the electronic apparatus through a second transmission medium, a content selection section to select a content to which a parental lock is to be set from among the contents accumulated in the accumulation apparatus, a release key setting section to set a key for releasing the parental lock for the content selected, a storage section to associate identification information of the content selected with the key set by the release key setting section and stores the identification information and the key associated with each other, and a parental lock notification section to notify the accumulation apparatus in which the content is accumulated of the identification information of the content to which the parental lock is set.