An image forming system including a first image forming apparatus and a second image forming apparatus that are connected to each other via a network, the first image forming apparatus, comprising: a transmitter unit transferring reproduced data of data for transfer to the second image forming apparatus via the network; a memory unit storing the data for transfer; and a data eraser unit erasing the data in the memory unit and transmitting an instruction to erase the corresponding data to the second image forming apparatus when a user inputs an instruction to erase the data for transfer, and the second image forming apparatus, comprising: a receiver unit receiving the transferred data; a memory unit storing the received data; and an eraser unit erasing the corresponding data in the memory unit according to the erase instruction transmitted from the first image forming apparatus.