A digital camera (1) stores captured picture data and E-mail address data inputted from a key entry unit (35) in a flash memory (31) so that they are associated with each other and then transfers the picture data and the E-mail address data to a personal computer via an I/O port (37) or an infrared communication unit (38). The personal computer receives the picture data and the E-mail address data transferred from the digital camera via an I/O port or an infrared communication unit (45). The received picture data is then transmitted to a destination terminal on a computer network on the basis of the received E-mail address data.