An image transmission system 1 includes a digital camera 10, a PC 40, and a Web server 50. This digital camera 10 stores therein a plurality of image data, print request information, and transmission request information. Further, the digital cameral 10 determines whether the connection destination is a printing device or an external apparatus different from the printing device, when a connection with the external unit is detected. The digital camera 10 transmits image data which is associated with the print request information to the print device, when it is determined that the connection destination is the print device, and transmits image data which is associated with the transmission request information to the external apparatus, when it is determined that the connection destination is the external apparatus. PC 40 receives the transmitted image data through a communication network connection 51 and transmits it to the Web server 50.