| 摘要 |
<p>Information can be transmitted to a server apparatus (600) in such a manner that it cannot be determined who is the transmission source. Each of a plurality of user terminals (500) comprises a data transmitting means (501) that transmits, to the server apparatus (600), at a predetermined timing, a positive parity value the parity of which is necessarily a one-bit value of "0" in a bit sequence consisting of the positive parity values of all of the user terminals (500) belonging to a given terminal set and that, when the local terminal has the sole transmission right, transmits the positive parity value or the inverted value thereof according to the values of bits to be transmitted. The server apparatus (600) comprises a data receiving means (601) that recognizes the data received from any one of the user terminals (500) belonging to the aforementioned terminal set, on the basis of whether the number of bits of parity determination values, which are included in the bit sequence consisting of the one-bit data received from all of the user terminals (500) belonging to the aforementioned terminal set, is an even number or not.</p> |
