The power consumption of a mobile station is reduced according to the conditions of use by a user without stopping packet communication necessary for the user. In a program for a base station apparatus, a request for establishing radio connection and information indicating the conditions of use of the mobile station apparatus are acquired from the mobile station apparatus (step S1). When the information indicating the conditions of use indicates the use of the mobile station apparatus, a first timer is set for a relatively long time whereas when the information indicating the conditions of use indicates the non-use of the mobile station apparatus, the first timer is set for a relatively short time. When the transmission of a packet to the mobile station apparatus is completed (step S4), the first timer is started up (steps S6 and S7), and when the first timer expires, a control signal is transmitted to the mobile station apparatus (step S8) to interrupt the radio connection to the mobile station apparatus (step S11).