A transmission apparatus of the present invention includes an encoder unit configured to encode data including plural layers for each of the layers, a packetizing unit configured to generate a packet based on the data encoded by the encoder unit, a determination unit configured to determine transmission intervals at which the generated packet is transmitted for each of the layers, and a transmission unit configured to transmit the generated packet at the determined transmission intervals, wherein the transmission intervals are changed for each specified packet, where the change varies with each of the plurality of layers.