A method of storing data comprises the steps of: storing at least a set of coded real-time data having packets respectively having variable coding data rates per a predetermined interval in a data memory; detecting a maximum among the variable coding data rates; storing data of the maximum in a control data memory; selectively reading at least the see of coded real-time data in response to a demand; adding dummy data to read at least the set of coded real-time data such that the resultant data has a fixed data rate equal to or more than the data of maximum from the control data memory per the predetermined interval; and outputting the resultant data. A data storing apparatus embodying the method mentioned above is also disclosed. The data storing apparatus may further comprise a receiving circuit for receiving coded data output demanding data including a desired data rate and for supplying the desired data rate to the adding circuit. The adding circuit receives and uses the desired data rate as the fixed data rate.