Patent ID: 8700703

Claim:
A contents server including a processor to execute processes containing: recording media information transmitted from a plurality of users in a communicatable state, in which a user is able to communicate, participating in a predetermined group, for each group; detecting a communicatable state or an uncommunicatable state, in which a user is not able to communicate, of each participating user, at each predetermined time; and deleting, upon detecting that all the participating users are in the communicatable state, media information from media information already recorded in the recording process, by cooperating with a comparing process which compares an oldest confirmation time among final confirmation times of the users in a user state table with a file writing time in a media data file and requests the deleting process to delete all media data files written before the oldest confirmation time; extracting media information recorded during a period from when the user is in the uncommunicatable state, till when the user is in the communicatable state again, from the recording process, when the detecting process detects that the user in the uncommunicatable state enters the communicatable state again; transmitting media information extracted by the extracting process to only the user who has entered the communicatable state again; and presenting media information extracted by the extracting process to a user who has entered the communicatable state again to enable the user to select information, and making the user transmit only information selected by the user to the transmitting process.