A store system comprises: store controller 21 incorporating programs for executing sales and sales management tasks; display 27 for displaying a screen for the execution of a task specified by each of the programs; first input means for inputting data to store controller 21 based on an instruction displayed on the screen produced on the display 27; and second input means for inputting handwritten or voice memo information to store controller 21. Store controller 21 requests an operator to select key information to be appended to the memo information when the operator inputs the memo information via the second input means, and stores the memo information, together with the appended key information, in a storage device within the system.