A communication service continuation system comprising: a server which provides a communication service; and a mobile terminal which is connected with the server via communication networks (5, 6, 7, 8) provided in parallel, wherein the mobile terminal comprises a transmitting information processing means for: while maintaining a communicating state with the server using one communication network, activating communications through another communication network, inserting delimiter information into transmitting information to be transmitted from the mobile terminal to the server, the delimiter information being information necessary for performing restoring processing in the server, and copying the transmitting information to be transmitted to the server to thereby transmit pieces of information having a same content through the one communication network and said another communication network; and wherein the transmitting information processing means switches communications from the one communication network being used to said another communication network, while maintaining the communicating state with the server, wherein the server and the mobile terminal each include a receiving information processing means (13, 23) having a plurality of receiving information processing sections (13#1..., 23#1...) designed such as to perform copying and processing in parallel on a plurality of pieces of receiving information of different contents, wherein each of the receiving information processing sections (13#1..., 23#1...) includes: a receiving information synthesizing means (131..., 231...) for synthesizing pieces of receiving information having the same content; a delimiter information elimination means (132, 232) for eliminating the delimiter information from the receiving information synthesized by the receiving information synthesizing means (131, 231); and a data inversion means (133, 233) for performing an inversion process to restore a part of data, to which a conversion process has been performed on a transmitting side, of the receiving information from which the delimiter information is eliminated. a server which provides a communication service; and a mobile terminal which is connected with the server via communication networks (5, 6, 7, 8) provided in parallel, wherein the mobile terminal comprises a transmitting information processing means for: while maintaining a communicating state with the server using one communication network, activating communications through another communication network, inserting delimiter information into transmitting information to be transmitted from the mobile terminal to the server, the delimiter information being information necessary for performing restoring processing in the server, and copying the transmitting information to be transmitted to the server to thereby transmit pieces of information having a same content through the one communication network and said another communication network; and while maintaining a communicating state with the server using one communication network, activating communications through another communication network, inserting delimiter information into transmitting information to be transmitted from the mobile terminal to the server, the delimiter information being information necessary for performing restoring processing in the server, and copying the transmitting information to be transmitted to the server to thereby transmit pieces of information having a same content through the one communication network and said another communication network; and wherein the transmitting information processing means switches communications from the one communication network being used to said another communication network, while maintaining the communicating state with the server, wherein the server and the mobile terminal each include a receiving information processing means (13, 23) having a plurality of receiving information processing sections (13#1..., 23#1...) designed such as to perform copying and processing in parallel on a plurality of pieces of receiving information of different contents, wherein each of the receiving information processing sections (13#1..., 23#1...) includes: a receiving information synthesizing means (131..., 231...) for synthesizing pieces of receiving information having the same content; a delimiter information elimination means (132, 232) for eliminating the delimiter information from the receiving information synthesized by the receiving information synthesizing means (131, 231); and a data inversion means (133, 233) for performing an inversion process to restore a part of data, to which a conversion process has been performed on a transmitting side, of the receiving information from which the delimiter information is eliminated. a receiving information synthesizing means (131..., 231...) for synthesizing pieces of receiving information having the same content; a delimiter information elimination means (132, 232) for eliminating the delimiter information from the receiving information synthesized by the receiving information synthesizing means (131, 231); and a data inversion means (133, 233) for performing an inversion process to restore a part of data, to which a conversion process has been performed on a transmitting side, of the receiving information from which the delimiter information is eliminated.