image pickup means for imaging an object and for generating image data;

recording means which records image data generated by said image pickup means, in a recording medium;

communication means for communicating with external equipments including an image scanner;

mode changing means for changing a mode of the imaging apparatus between an image pickup mode in which said image pickup means generates the image data and said recording means records the image data in said recording medium and a communication mode in which said communication means communicates with said image scanner and receives image data transmitted by said image scanner and said recording means records the received image data in the recording medium;

setting means which sets an image size of the image data to be generated by said image-pickup means in the image pickup mode and stores an image size information indicating the set image size in a storage unit;

an instruction button which instructs an image pickup operation by said image pickup means in the image pickup mode and instructs a start of an image reading operation by said image scanner in the communication mode; and

control means which controls said image pickup means, in the image pickup mode, in accordance with the image size information stored in the storage unit, said imaging means to generate the image data of the image size indicated by the image size information stored in the storage unit in response to the instruction from said instruction button, and controls said communication means, in the communication mode, to transmit a command for instructing the start of an image reading operation and the image size information stored in the storage unit to said image scanner in response to the instruction from said instruction button so that image data of the image size indicated by the image size information are transmitted from said image scanner and received by said communication means.