12. A document processing system according to claim 7 , wherein said first control means is capable of transmitting an electronic document together with said request information to said service providing unit via said first transmitter, and said second control means requests via said second transmitter said authoring unit to produce an tagged electronic document of said electronic document received via said second receiver, and when the tagged electronic document is received from said authoring unit via said second receiver, said second control means transmits said tagged electronic document to said user terminal via said second transmitter.
12. A document processing system according to claim 7 , wherein said first control means is capable of transmitting an electronic document together with said request information to said service providing unit via said first transmitter, and said second control means requests via said second transmitter said authoring unit to produce an tagged electronic document of said electronic document received via said second receiver, and when the tagged electronic document is received from said authoring unit via said second receiver, said second control means transmits said tagged electronic document to said user terminal via said second transmitter. 13. A document processing system according to claim 12 , wherein said first control means, as said specification information specifying an electronic document, an identifier indicating an electronic document transmitted to said service providing unit from said user terminal, to said service providing unit via said first transmitter.