1. An information terminal, comprising: circuitry configured to: store a part of content data updated in an information storage that stores a plurality of types of content data, as update information associated with the respective types of content data, wherein the plurality of types of content data are unrelated and each correspond to all of the most recent events of different applications executed by the information terminal; monitor an update of the content data, store, when the content data is updated, the part of the updated content data as the update information associated with the respective types, and read out, during a predetermined screen display state, the update information associated with the respective types of content data in a chronological order of the updates of the content data; and arrange the individual time-series update information that have been read out on a plurality of predetermined object images respectively corresponding thereto, and align and display the predetermined object images on which the update information are arranged individually on a screen in the chronological order of the update information, wherein each of the predetermined object images displays an indicator which indicates which of the different applications the respective predetermined object image corresponds to, and each of the update information of the predetermined object images is independent of the other update information on other predetermined object images such that each of the update information does not include a portion of any other update information arranged individually on the screen in the chronological order, wherein the different applications executed by the information terminal include at least a call processing application, an electronic messaging application, and a multimedia application, the types of content data associated with the call processing application include at least one of content data indicating a most recent received call at the information terminal, content data indicating a most recent missed call at the information terminal and content data indicating a most recent outgoing call at the information terminal, the types of content data associated with the an electronic messaging application include at least one of content data indicating a most recent received electronic message at the information terminal and content data indicating a most recent outgoing electronic message at the information terminal, the types of content data associated with the multimedia application include at least one of content data indicating a most recent addition of a new multimedia item at the information terminal and content data indicating a most recent deletion of an existing multimedia item at the information terminal, and the circuitry is further configured to: read out, when a filtering instruction that requests update information associated with different pieces of content data of the same type is input by a user via a user operation input section, the update information associated with the different pieces of content data of the same type in the chronological order of the updates every time the filtering instruction is input, and arrange the individual time-series update information that have been read out and are associated with the different pieces of content data of the same type on the plurality of predetermined object images, and switch the alignment display of the plurality of predetermined object images on which the update information are arranged individually every time the filtering instruction is input.