A conference system comprising: a conference information storage part that stores information concerning a conference, said information comprising conference material; a client information storage part that stores data formats corresponding to types of terminal apparatuses, in a table associating them with information indicating the type of each of the terminal apparatuses; a negotiation process part that receives, from the terminal apparatuses that participate in the conference, the sets of information indicating the types of the terminal apparatuses; a conversion part that converts the information concerning the conference, based on the data formats associated with the sets of information indicating the types of the terminal apparatuses in the client information storage part received by the negotiation process part, into at least first download data corresponding to a first page of the conference material and second download data corresponding to remaining pages of the conference material to be transmitted to the plurality of terminal apparatuses participating in the conference; and a transmission part that transmits the first download data including the first page of the conference material to the terminal apparatuses, wherein the terminal apparatuses are transmission sources of the sets of information indicating the types of the terminal apparatuses and transmitting the second download data including the remaining pages of the conference material different from the first page to the terminal apparatuses that are transmission sources of the sets of information indicating the types of the terminal apparatuses after transmitting the first download data, wherein the conference system is configured to start the conference already when the first download data has been downloaded to the terminal apparatuses. a conference information storage part that stores information concerning a conference, said information comprising conference material; a client information storage part that stores data formats corresponding to types of terminal apparatuses, in a table associating them with information indicating the type of each of the terminal apparatuses; a negotiation process part that receives, from the terminal apparatuses that participate in the conference, the sets of information indicating the types of the terminal apparatuses; a conversion part that converts the information concerning the conference, based on the data formats associated with the sets of information indicating the types of the terminal apparatuses in the client information storage part received by the negotiation process part, into at least first download data corresponding to a first page of the conference material and second download data corresponding to remaining pages of the conference material to be transmitted to the plurality of terminal apparatuses participating in the conference; and a transmission part that transmits the first download data including the first page of the conference material to the terminal apparatuses, wherein the terminal apparatuses are transmission sources of the sets of information indicating the types of the terminal apparatuses and transmitting the second download data including the remaining pages of the conference material different from the first page to the terminal apparatuses that are transmission sources of the sets of information indicating the types of the terminal apparatuses after transmitting the first download data, wherein the conference system is configured to start the conference already when the first download data has been downloaded to the terminal apparatuses.