A method for managing timings of checking update of a download control metafile by a downloader of an information processing apparatus including a real time clock, the method comprising a system initial setup processing and a timer interrupt processing, the system initial setup processing being characterized by: a step of receiving an input of a check cycle time of the download control metafile from an user; a step of setting the input of the check cycle time in a field of the check cycle time; a step of generating a random number in such a way as to cause every information processing apparatus to generate a different value; based said value, a step of generating a reference time-and-date for checking the download control metafile; a step of storing the time-and-date thus generated in a next check schedule time/date; and a step of setting a timer interrupt generation request of the time point of the next check schedule time/date in the real time clock; the timer interrupt processing being executed after having set up the timer interrupt generation request and comprising: when it becomes the time point that is set by the timer interrupt generation request, a step of copying the value of the next check schedule time/date to a last check time/date; a step of executing a download update processing; a step of storing a value obtained by adding the check cycle time to the last check time/date in the next check schedule time/date; a step of setting the timer interrupt generation request of the time point of the next check schedule time/date in the real time clock, wherein the timer interrupt processing is performed in accordance with the check cycle time. a step of receiving an input of a check cycle time of the download control metafile from an user; a step of setting the input of the check cycle time in a field of the check cycle time; a step of generating a random number in such a way as to cause every information processing apparatus to generate a different value; based said value, a step of generating a reference time-and-date for checking the download control metafile; a step of storing the time-and-date thus generated in a next check schedule time/date; and a step of setting a timer interrupt generation request of the time point of the next check schedule time/date in the real time clock; the timer interrupt processing being executed after having set up the timer interrupt generation request and comprising: when it becomes the time point that is set by the timer interrupt generation request, a step of copying the value of the next check schedule time/date to a last check time/date; a step of executing a download update processing; a step of storing a value obtained by adding the check cycle time to the last check time/date in the next check schedule time/date; a step of setting the timer interrupt generation request of the time point of the next check schedule time/date in the real time clock, wherein the timer interrupt processing is performed in accordance with the check cycle time. when it becomes the time point that is set by the timer interrupt generation request, a step of copying the value of the next check schedule time/date to a last check time/date; a step of executing a download update processing; a step of storing a value obtained by adding the check cycle time to the last check time/date in the next check schedule time/date; a step of setting the timer interrupt generation request of the time point of the next check schedule time/date in the real time clock, wherein the timer interrupt processing is performed in accordance with the check cycle time.