Data broadcast has become a widely accepted approach of communication in the mobile computing environment. However, because broadcast channels are shared by a large set of data items, the expected delay of receiving a desired data item may increase. With the objective of minimizing this wait time, this paper explores the problem of data broadcast over multiple channels, and proposes a new broadcast scheduling scheme named NOBSA. The proposed scheme regards each broadcast channel as a constant number of sub-channels, allocates data items on each sub-channel, assuming flat data scheduling per sub-channel. By employing a concept of sub-channels, NOBSA can reflect a variation of access probabilities among data items allocated on the same broadcast channel to the broadcast schedule, and thus enhance the performance. Simulation is performed to evaluate the performance of NOBSA. The simulation results show that the performance of NOBSA is nearly close to that of the theoretical lower bound in terms of the average expected delay time.