1. A printing apparatus comprising: (A) a memory that stores data; (B) an interface that connects to an external memory; and (C) a processor that executes a set of instructions: (a) to instruct (i) to print data stored in the memory or (ii) to print data stored in the external memory, based on a user operation; (b) to display, in a case when a predetermined instruction to the data stored in the memory is instructed, a first screen that includes an instruction for instructing to delete the data stored in the memory after printing the data stored in the memory; (c) to display, in a case when a predetermined instruction regarding the data stored in the external memory is instructed, a second screen that does not include the instruction for instructing to delete the data after printing the data; (d) to receive a print start instruction from a user; (e) upon receiving the print start instruction from the user in a case in which the instruction has been instructed on the first screen, to print the data stored in the memory and to delete the data stored in the memory after printing the data stored in the memory; and (f) upon receiving the print start instruction from the user in a case in which the instruction has not been instructed on the first screen, to print the data stored in the memory without deleting the data stored in the memory after printing the data stored in the memory.