| 摘要 |
PROBLEM TO BE SOLVED: To allow a user to exchange only data which meets conditions set by the user only with a person who meets conditions set by the user, when data is exchanged among unspecified users, without distributing his or her user identification information to the other users.SOLUTION: Data exchange means 104 includes a step of determining, as for a set of a transmission selection condition and a reception selection condition, whether a transmitting user corresponding to the transmission selection condition of the set and a receiving user corresponding to the reception selection condition of the set meet a criterion for exchanging data, via the set. |
