1. An apparatus connectable to external apparatuses, comprising: a scanner device configured to read a document and create image data based on the document; a memory configured to store a plurality of the image data accessible by any of the external apparatuses, each of the plurality of the image data having been created from the document and having an image format; a printing device configured to print the plurality of the image data; a request receiving unit configured to receive, from one external apparatus among the external apparatuses, a request for selecting at least one image data among the plurality of the image data which are created by the scanner device and stored in the memory, and for converting an image format of the selected at least one image data to a second image format; an image data format converter configured to create converted image data by converting the image format of the selected at least one image data to the second image format according to the request received by the request receiving unit; and a sending unit configured to send the converted image data to the external apparatus which sent the request.