To provide a wireless LAN communication apparatus capable of extension for sharing and transmitting data, and to provide a program and control method for controlling wireless LAN communication apparatus.

The master wireless LAN communication apparatus 2000 divides transmission data, generates a plurality of partial transmission data, distributes the partial transmission data to a slave wireless LAN communication apparatus 3000, transmits a transmission synchronization signal to the slave wireless LAN communication apparatus 3000, and wirelessly transmits the remaining partial transmission data having not been distributed to the slave wireless LAN communication apparatus 3000 on the basis of the transmission timing of a transmission synchronization signal.