To provide a moving image insertion system, that inserts other moving image data into moving image data that are communicated.

A moving image data capture section 1-2 of a mobile terminal 1 captures moving image data and a data transmission reception section 1-1 transmits moving image data captured by the moving image data capture section 1-2 to a switch 2. A data transmission reception section 2-1 of the switch 2 transmits the moving image data from the mobile terminal 1 to a data compositing section 2-2. Then the data compositing section 2-2 composites the moving image data from the data transmission reception section 2-1 with the moving image data from a control terminal 4 to transmit the composited data to the data transmission reception section 2-1, and the data transmission reception section 2-1 transmits the moving image data from the data compositing section 2-2 to a mobile terminal 3. A data transmission reception section 3-1 of the mobile terminal 3 transmits the moving image data from the switch 2 to a moving image data display section 3-3 and the moving image display section 3-3 displays the moving image data from the data transmission reception section 3-1.