The present technique relates to a device control apparatus, a device apparatus, a control method, a program, and a device control system that allow execution of a process needing a processing time longer than a processing time permitted for one command. A transmission unit of host equipment transmits, to the device apparatus, a first command for causing a prescribed process to be divided and executed. A reception unit of the host equipment acquires, from the device apparatus, a remaining number of times needed before completion of the prescribed process, after a division process of the device apparatus based on the first command is completed. The transmission unit of the host equipment repeatedly executes transmission of the first command the remaining number of times. The present technique is applicable to, for example, a digital camera controlling a memory card.

A method for real-time-based transfer of data telegrams from a verified transmitter to a verified receiver without delays, wherein (a) each data telegram to be transferred from the transmitter to the receiver is provided with an additional data index, (b) each received data is stored in a memory, along with the associated additional data index, (c) after elapse of a predetermined time interval, or after transference of a defined number of data telegrams, the transmitter transfers a second time data telegram already transferred to the receiver which has an additional signature, and where the data telegram transferred the second time is additionally encrypted by the transmitter, and (d) after receiving the signed data telegram transferred the second time, the signed data telegram transferred the second time is compared with the corresponding data telegram stored in the memory to verify the transmitter, and where (e) steps a) to d) are repeated.

A method for real-time-based transfer of data telegrams from a verified transmitter to a verified receiver without delays, wherein (a) each data telegram to be transferred from the transmitter to the receiver is provided with an additional data index, (b) each received data is stored in a memory, along with the associated additional data index, (c) after elapse of a predetermined time interval, or after transference of a defined number of data telegrams, the transmitter transfers a second time data telegram already transferred to the receiver which has an additional signature, and where the data telegram transferred the second time is additionally encrypted by the transmitter, and (d) after receiving the signed data telegram transferred the second time, the signed data telegram transferred the second time is compared with the corresponding data telegram stored in the memory to verify the transmitter, and where (e) steps a) to d) are repeated.