A drug prescription assistance method of a server (2) for controlling the allowability of accessing a dosage history via a communication network (N), wherein the server (2) executes the steps of: receiving user data and prescribed drug data from a user terminal (1); setting, when the user data and prescribed drug data are received, an accessibility identifier indicating the allowability of accessing, from a pharmacy terminal (4), the dosage history of a user corresponding to the user data out of a database in which an individual and the dosage history of the individual are correlated, to an identifier meaning that the access is allowed; receiving a processing-finished signal from the pharmacy terminal (4); and changing, when the processing-finished signal is received, the accessibility identifier to an identifier meaning that the access is not allowed.
