To provide a vehicle-mounted communication device for reducing a response delay.

A control circuit 11 confirms the source of an HTML file and distributes data requested to a center to a data communication terminal 12 and a cellular phone 13, when the control circuit 11 receives the HTML file from the center via the data communication terminal 12 (steps S1-S4). Then, regarding data distributed to the cellular phone 13, the control circuit 11 requests data to the center via the cellular phone 13, and receives the data from the center via the cellular phone 13 (steps S6-S9). However, where there is a voice arrival signal, interruption is permitted (steps S10-S13). For data distributed to the data communication terminal 12, the control circuit 11 requests data to the center via the data communication terminal 12, and receives data from the center via the data communication terminal 12 (steps S14-S16).