To provide a network scanner device for processing the security of a destination and the security of image data with excellent availability in transmitting the image data through a network.

This network scanner device 2 stores destination information comprising at least a user name, a password, distribution destination information and other referable destination IDs that can be used by the user of the destination as a destination management table in a storing part 18, authenticates the user on the basis of a set of the user name and the password, allows only the user successful in user authentication to use the destination information, and displays referable destinations on a display part 13. When image data of an original read by an image reading part 16 is stored in a storing part 18, the network scanner device 2 prepares a document management table that makes a destination appropriately selected from the referable destinations displayed on the display part 13 to be a referable destination of the image data and stores the document management table in the storing part 18 to protect the confidentiality of the destination and the document.