Patent ID: 8170232

Claim:
A vehicle-mounted device comprising: a connection section connected to an external device; a first operation button configured to start a process of searching pieces of content stored in the external device; a content list acquisition section configured to acquire, from the external device and when the first operation button is operated, a content list having a hierarchical structure under which the pieces of content are classified as items; a storage section configured to store the content list; a second operation button having a rotatable and pushable operation controller which when rotated selects an item of the content list displayed on a predetermined display section, and when pushed changes what is displayed among the content list from an upper stratum to a lower stratum and sets the item; a third operation button configured to change what is displayed among the content list from the lower stratum to the upper stratum; and a light emitting control section configured to perform operation guidance to prompt performance of a next operation by changing a light emitting state of the second operation button in response to an operation of the first operation button.