According to one embodiment, an electronic device includes a policy acquirer, a random number generator and a confirmation time determination processor. The policy acquirer acquires policy information indicating a common storage area storing an update program, and a time period in which presence or absence of the update program in the common storage area is to be confirmed. The random number generator generates a random number. The confirmation time determination processor creates a plurality of candidate times by dividing the time period by a predetermined time unit, and determines a confirmation time at which presence or absence of the update program is to be confirmed by selecting one of the plurality of candidate times using the random number.