A mobile apparatus includes a user interface configured to allow a user to select an image scan apparatus, a communication interface configured to transmit a scan command to the selected image scan apparatus and receive a plurality of image data from the selected image scan apparatus via a streaming method, and a controller configured to generate a scan image using the plurality of image data.

A communication apparatus includes a conversion unit configured to convert data, an estimation unit configured to estimate a size after conversion of the data by the conversion unit before the conversion unit converts the data, and a notification unit configured to notify another communication apparatus of the size estimated by the estimation unit.

A method of generating an image file includes providing an electronic page through an electronic device; acquiring a plurality of images including at least a portion of the electronic page based on a user's input; and generating an image file including at least a first image and a second image of the plurality of images.

A method of generating an image file includes providing an electronic page through an electronic device; acquiring a plurality of images including at least a portion of the electronic page based on a user's input; and generating an image file including at least a first image and a second image of the plurality of images.